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Can you help me solve this algebra problem?
8th Grade Algebra Problem I Can't SolveA problem with exponent laws…How can I solve for this variable?Age Problem (Equation Writing Help)Help on Algebra ProblemCan someone show me how to solve these matrix?Precalculus algebra problemIf $y=frac {a+bz}{c+dz}$, $z=frac{a+bx}{c+dx}$, $x=frac{a+by}{c+dy}$, then $ad + bc + b^2 + c^2 = 0$Algebra precalculus problemPrecalculus algebra exercise
$begingroup$
Hi I need to solve this problem and I don’t know how. I’d appreciate your help.
If $x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2}$ and $xneq yneq z$, then $$x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2} = x + y + z - a$$
I think I need to
$x^3 - ayz = x^2k$
$y^3 - azx = y^2k,$
$z^3 - axy = z^2k$
then to multiply both sides of each equality by some quantity, add them all together and factor but I don’t know how to find that quantity.
algebra-precalculus systems-of-equations
$endgroup$
add a comment |
$begingroup$
Hi I need to solve this problem and I don’t know how. I’d appreciate your help.
If $x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2}$ and $xneq yneq z$, then $$x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2} = x + y + z - a$$
I think I need to
$x^3 - ayz = x^2k$
$y^3 - azx = y^2k,$
$z^3 - axy = z^2k$
then to multiply both sides of each equality by some quantity, add them all together and factor but I don’t know how to find that quantity.
algebra-precalculus systems-of-equations
$endgroup$
$begingroup$
Are you trying to prove the last equality? It's not clear.
$endgroup$
– Victor S.
3 hours ago
$begingroup$
@VictorS. I need to prove that each expression is equal to x + y + z - a
$endgroup$
– questions about math
3 hours ago
$begingroup$
This isn't an answer. However, it could help... $$$$Observe that $$(x+y+z-a)-bigg(x-frac{ayz}{x^2}bigg)=frac{ayz+yx^2+zx^2-ax^2}{x^2}=frac{a(yz-x^2)+x^2(y+z)}{x^2}$$ This equals zero iff $$a(x^2-yz)=x^2(y+z)iff a-frac{ayz}{x^2}=y+z$$ $$iff a·bigg(frac{x^2-yz}{x^2}bigg)=y+ziff a=frac{x^2y+x^2z}{x^2-yz}$$
$endgroup$
– Dr. Mathva
1 hour ago
add a comment |
$begingroup$
Hi I need to solve this problem and I don’t know how. I’d appreciate your help.
If $x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2}$ and $xneq yneq z$, then $$x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2} = x + y + z - a$$
I think I need to
$x^3 - ayz = x^2k$
$y^3 - azx = y^2k,$
$z^3 - axy = z^2k$
then to multiply both sides of each equality by some quantity, add them all together and factor but I don’t know how to find that quantity.
algebra-precalculus systems-of-equations
$endgroup$
Hi I need to solve this problem and I don’t know how. I’d appreciate your help.
If $x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2}$ and $xneq yneq z$, then $$x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2} = x + y + z - a$$
I think I need to
$x^3 - ayz = x^2k$
$y^3 - azx = y^2k,$
$z^3 - axy = z^2k$
then to multiply both sides of each equality by some quantity, add them all together and factor but I don’t know how to find that quantity.
algebra-precalculus systems-of-equations
algebra-precalculus systems-of-equations
edited 35 mins ago
Michael Rozenberg
104k1892197
104k1892197
asked 3 hours ago
questions about mathquestions about math
644
644
$begingroup$
Are you trying to prove the last equality? It's not clear.
$endgroup$
– Victor S.
3 hours ago
$begingroup$
@VictorS. I need to prove that each expression is equal to x + y + z - a
$endgroup$
– questions about math
3 hours ago
$begingroup$
This isn't an answer. However, it could help... $$$$Observe that $$(x+y+z-a)-bigg(x-frac{ayz}{x^2}bigg)=frac{ayz+yx^2+zx^2-ax^2}{x^2}=frac{a(yz-x^2)+x^2(y+z)}{x^2}$$ This equals zero iff $$a(x^2-yz)=x^2(y+z)iff a-frac{ayz}{x^2}=y+z$$ $$iff a·bigg(frac{x^2-yz}{x^2}bigg)=y+ziff a=frac{x^2y+x^2z}{x^2-yz}$$
$endgroup$
– Dr. Mathva
1 hour ago
add a comment |
$begingroup$
Are you trying to prove the last equality? It's not clear.
$endgroup$
– Victor S.
3 hours ago
$begingroup$
@VictorS. I need to prove that each expression is equal to x + y + z - a
$endgroup$
– questions about math
3 hours ago
$begingroup$
This isn't an answer. However, it could help... $$$$Observe that $$(x+y+z-a)-bigg(x-frac{ayz}{x^2}bigg)=frac{ayz+yx^2+zx^2-ax^2}{x^2}=frac{a(yz-x^2)+x^2(y+z)}{x^2}$$ This equals zero iff $$a(x^2-yz)=x^2(y+z)iff a-frac{ayz}{x^2}=y+z$$ $$iff a·bigg(frac{x^2-yz}{x^2}bigg)=y+ziff a=frac{x^2y+x^2z}{x^2-yz}$$
$endgroup$
– Dr. Mathva
1 hour ago
$begingroup$
Are you trying to prove the last equality? It's not clear.
$endgroup$
– Victor S.
3 hours ago
$begingroup$
Are you trying to prove the last equality? It's not clear.
$endgroup$
– Victor S.
3 hours ago
$begingroup$
@VictorS. I need to prove that each expression is equal to x + y + z - a
$endgroup$
– questions about math
3 hours ago
$begingroup$
@VictorS. I need to prove that each expression is equal to x + y + z - a
$endgroup$
– questions about math
3 hours ago
$begingroup$
This isn't an answer. However, it could help... $$$$Observe that $$(x+y+z-a)-bigg(x-frac{ayz}{x^2}bigg)=frac{ayz+yx^2+zx^2-ax^2}{x^2}=frac{a(yz-x^2)+x^2(y+z)}{x^2}$$ This equals zero iff $$a(x^2-yz)=x^2(y+z)iff a-frac{ayz}{x^2}=y+z$$ $$iff a·bigg(frac{x^2-yz}{x^2}bigg)=y+ziff a=frac{x^2y+x^2z}{x^2-yz}$$
$endgroup$
– Dr. Mathva
1 hour ago
$begingroup$
This isn't an answer. However, it could help... $$$$Observe that $$(x+y+z-a)-bigg(x-frac{ayz}{x^2}bigg)=frac{ayz+yx^2+zx^2-ax^2}{x^2}=frac{a(yz-x^2)+x^2(y+z)}{x^2}$$ This equals zero iff $$a(x^2-yz)=x^2(y+z)iff a-frac{ayz}{x^2}=y+z$$ $$iff a·bigg(frac{x^2-yz}{x^2}bigg)=y+ziff a=frac{x^2y+x^2z}{x^2-yz}$$
$endgroup$
– Dr. Mathva
1 hour ago
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
Denote $k=xyz$. Let us consider the equation
$$
t-frac{ak}{t^3}=btag{*}
$$ where $b =x-frac{ayz}{x^2}=y-frac{azx}{y^2}=z-frac{axy}{z^2},$ and $x,y,z$ are distinct, non-zero roots of $(*)$. Note that $(*)$ can be written as a 4-th degree polynomial equation
$$
t^4-b t^3-ak=0.
$$ By Vieta's formula, the fourth root $w$ satisfies
$$
x+y+z+w=b text{ and } xyzw=-ak.
$$ Since $k=xyzne 0$ it follows
$$
w=-a=b-x-y-z,
$$ hence we get
$$
b=x+y+z-a=x-frac{ayz}{x^2}=y-frac{azx}{y^2}=z-frac{axy}{z^2}
$$as wanted.
$endgroup$
add a comment |
$begingroup$
$$x-frac{ayz}{x^2}=y-frac{axz}{y^2}$$ gives
$$x-y+azleft(frac{x}{y^2}-frac{y}{x^2}right)=0$$ or
$$1+frac{az(x^2+xy+y^2)}{x^2y^2}=0.$$
Similarly, $$frac{ax(y^2+yz+z^2)}{y^2z^2}=-1$$ and
$$frac{ay(x^2+xz+z^2)}{x^2z^2}=-1.$$
Thus, $$x^3(y^2+yz+z^2)=y^3(x^2+xz+z^2)$$ or
$$(x-y)(x^2y^2+xyz(x+y)+z^2(x^2+xy+y^2))=0$$ or
$$sum_{cyc}(x^2y^2+x^2yz)=0$$ or
$$sum_{cyc}z^2(x+y)^2=0,$$ which gives $$x+y=x+z=y+z=0$$ or
$$x=y=z=0,$$ which is impossible.
Id est, the given is wrong, which says that
$$x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2}Rightarrow x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2} = x + y + z - a$$ is true.
$endgroup$
add a comment |
Your Answer
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Denote $k=xyz$. Let us consider the equation
$$
t-frac{ak}{t^3}=btag{*}
$$ where $b =x-frac{ayz}{x^2}=y-frac{azx}{y^2}=z-frac{axy}{z^2},$ and $x,y,z$ are distinct, non-zero roots of $(*)$. Note that $(*)$ can be written as a 4-th degree polynomial equation
$$
t^4-b t^3-ak=0.
$$ By Vieta's formula, the fourth root $w$ satisfies
$$
x+y+z+w=b text{ and } xyzw=-ak.
$$ Since $k=xyzne 0$ it follows
$$
w=-a=b-x-y-z,
$$ hence we get
$$
b=x+y+z-a=x-frac{ayz}{x^2}=y-frac{azx}{y^2}=z-frac{axy}{z^2}
$$as wanted.
$endgroup$
add a comment |
$begingroup$
Denote $k=xyz$. Let us consider the equation
$$
t-frac{ak}{t^3}=btag{*}
$$ where $b =x-frac{ayz}{x^2}=y-frac{azx}{y^2}=z-frac{axy}{z^2},$ and $x,y,z$ are distinct, non-zero roots of $(*)$. Note that $(*)$ can be written as a 4-th degree polynomial equation
$$
t^4-b t^3-ak=0.
$$ By Vieta's formula, the fourth root $w$ satisfies
$$
x+y+z+w=b text{ and } xyzw=-ak.
$$ Since $k=xyzne 0$ it follows
$$
w=-a=b-x-y-z,
$$ hence we get
$$
b=x+y+z-a=x-frac{ayz}{x^2}=y-frac{azx}{y^2}=z-frac{axy}{z^2}
$$as wanted.
$endgroup$
add a comment |
$begingroup$
Denote $k=xyz$. Let us consider the equation
$$
t-frac{ak}{t^3}=btag{*}
$$ where $b =x-frac{ayz}{x^2}=y-frac{azx}{y^2}=z-frac{axy}{z^2},$ and $x,y,z$ are distinct, non-zero roots of $(*)$. Note that $(*)$ can be written as a 4-th degree polynomial equation
$$
t^4-b t^3-ak=0.
$$ By Vieta's formula, the fourth root $w$ satisfies
$$
x+y+z+w=b text{ and } xyzw=-ak.
$$ Since $k=xyzne 0$ it follows
$$
w=-a=b-x-y-z,
$$ hence we get
$$
b=x+y+z-a=x-frac{ayz}{x^2}=y-frac{azx}{y^2}=z-frac{axy}{z^2}
$$as wanted.
$endgroup$
Denote $k=xyz$. Let us consider the equation
$$
t-frac{ak}{t^3}=btag{*}
$$ where $b =x-frac{ayz}{x^2}=y-frac{azx}{y^2}=z-frac{axy}{z^2},$ and $x,y,z$ are distinct, non-zero roots of $(*)$. Note that $(*)$ can be written as a 4-th degree polynomial equation
$$
t^4-b t^3-ak=0.
$$ By Vieta's formula, the fourth root $w$ satisfies
$$
x+y+z+w=b text{ and } xyzw=-ak.
$$ Since $k=xyzne 0$ it follows
$$
w=-a=b-x-y-z,
$$ hence we get
$$
b=x+y+z-a=x-frac{ayz}{x^2}=y-frac{azx}{y^2}=z-frac{axy}{z^2}
$$as wanted.
edited 15 mins ago
answered 49 mins ago
SongSong
14.5k1635
14.5k1635
add a comment |
add a comment |
$begingroup$
$$x-frac{ayz}{x^2}=y-frac{axz}{y^2}$$ gives
$$x-y+azleft(frac{x}{y^2}-frac{y}{x^2}right)=0$$ or
$$1+frac{az(x^2+xy+y^2)}{x^2y^2}=0.$$
Similarly, $$frac{ax(y^2+yz+z^2)}{y^2z^2}=-1$$ and
$$frac{ay(x^2+xz+z^2)}{x^2z^2}=-1.$$
Thus, $$x^3(y^2+yz+z^2)=y^3(x^2+xz+z^2)$$ or
$$(x-y)(x^2y^2+xyz(x+y)+z^2(x^2+xy+y^2))=0$$ or
$$sum_{cyc}(x^2y^2+x^2yz)=0$$ or
$$sum_{cyc}z^2(x+y)^2=0,$$ which gives $$x+y=x+z=y+z=0$$ or
$$x=y=z=0,$$ which is impossible.
Id est, the given is wrong, which says that
$$x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2}Rightarrow x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2} = x + y + z - a$$ is true.
$endgroup$
add a comment |
$begingroup$
$$x-frac{ayz}{x^2}=y-frac{axz}{y^2}$$ gives
$$x-y+azleft(frac{x}{y^2}-frac{y}{x^2}right)=0$$ or
$$1+frac{az(x^2+xy+y^2)}{x^2y^2}=0.$$
Similarly, $$frac{ax(y^2+yz+z^2)}{y^2z^2}=-1$$ and
$$frac{ay(x^2+xz+z^2)}{x^2z^2}=-1.$$
Thus, $$x^3(y^2+yz+z^2)=y^3(x^2+xz+z^2)$$ or
$$(x-y)(x^2y^2+xyz(x+y)+z^2(x^2+xy+y^2))=0$$ or
$$sum_{cyc}(x^2y^2+x^2yz)=0$$ or
$$sum_{cyc}z^2(x+y)^2=0,$$ which gives $$x+y=x+z=y+z=0$$ or
$$x=y=z=0,$$ which is impossible.
Id est, the given is wrong, which says that
$$x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2}Rightarrow x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2} = x + y + z - a$$ is true.
$endgroup$
add a comment |
$begingroup$
$$x-frac{ayz}{x^2}=y-frac{axz}{y^2}$$ gives
$$x-y+azleft(frac{x}{y^2}-frac{y}{x^2}right)=0$$ or
$$1+frac{az(x^2+xy+y^2)}{x^2y^2}=0.$$
Similarly, $$frac{ax(y^2+yz+z^2)}{y^2z^2}=-1$$ and
$$frac{ay(x^2+xz+z^2)}{x^2z^2}=-1.$$
Thus, $$x^3(y^2+yz+z^2)=y^3(x^2+xz+z^2)$$ or
$$(x-y)(x^2y^2+xyz(x+y)+z^2(x^2+xy+y^2))=0$$ or
$$sum_{cyc}(x^2y^2+x^2yz)=0$$ or
$$sum_{cyc}z^2(x+y)^2=0,$$ which gives $$x+y=x+z=y+z=0$$ or
$$x=y=z=0,$$ which is impossible.
Id est, the given is wrong, which says that
$$x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2}Rightarrow x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2} = x + y + z - a$$ is true.
$endgroup$
$$x-frac{ayz}{x^2}=y-frac{axz}{y^2}$$ gives
$$x-y+azleft(frac{x}{y^2}-frac{y}{x^2}right)=0$$ or
$$1+frac{az(x^2+xy+y^2)}{x^2y^2}=0.$$
Similarly, $$frac{ax(y^2+yz+z^2)}{y^2z^2}=-1$$ and
$$frac{ay(x^2+xz+z^2)}{x^2z^2}=-1.$$
Thus, $$x^3(y^2+yz+z^2)=y^3(x^2+xz+z^2)$$ or
$$(x-y)(x^2y^2+xyz(x+y)+z^2(x^2+xy+y^2))=0$$ or
$$sum_{cyc}(x^2y^2+x^2yz)=0$$ or
$$sum_{cyc}z^2(x+y)^2=0,$$ which gives $$x+y=x+z=y+z=0$$ or
$$x=y=z=0,$$ which is impossible.
Id est, the given is wrong, which says that
$$x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2}Rightarrow x - frac{ayz}{x^2} = y - frac{azx}{y^2} = z - frac{axy}{z^2} = x + y + z - a$$ is true.
answered 45 mins ago
Michael RozenbergMichael Rozenberg
104k1892197
104k1892197
add a comment |
add a comment |
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$begingroup$
Are you trying to prove the last equality? It's not clear.
$endgroup$
– Victor S.
3 hours ago
$begingroup$
@VictorS. I need to prove that each expression is equal to x + y + z - a
$endgroup$
– questions about math
3 hours ago
$begingroup$
This isn't an answer. However, it could help... $$$$Observe that $$(x+y+z-a)-bigg(x-frac{ayz}{x^2}bigg)=frac{ayz+yx^2+zx^2-ax^2}{x^2}=frac{a(yz-x^2)+x^2(y+z)}{x^2}$$ This equals zero iff $$a(x^2-yz)=x^2(y+z)iff a-frac{ayz}{x^2}=y+z$$ $$iff a·bigg(frac{x^2-yz}{x^2}bigg)=y+ziff a=frac{x^2y+x^2z}{x^2-yz}$$
$endgroup$
– Dr. Mathva
1 hour ago