Do you know abc of algebra

Algebra Level 1

If a b c 0 abc \neq 0 and a x a^{x} = b , b y b^{y} = c, c z c^{z} = a . Then find the value of xyz

1 2 \frac{-1}{2} 2 1 0

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5 solutions

Anthony Ng
Jun 17, 2014

c z c^{z} = a

a = c z c^{z}

Since b y b^{y} = c , then we can substitute in c into our equation, a = c z c^{z} , so that we get

a = ( b y ) z (b^{y})^{z}

And now, since a x a^{x} = b , we can substitute b into our equation a = ( b y ) z (b^{y})^{z} , and get

a = ( ( a x ) y ) z ((a^{x})^{y})^{z}

And through Exponent Rules, we can simplify and end up with

a = a x y z a^{xyz}

a 1 a^{1} = a x y z a^{xyz}

1 = x y z \boxed{1 = xyz}

Micah Wood
Jun 17, 2014

b = a x c = b y = ( a x ) y a = c z = ( b y ) z = ( ( a x ) y ) z \large b =a^x \\ \large c = b^y = (a^x)^y \\ \large a = c^z = (b^y)^z = ((a^x)^y)^z

So we have a = ( ( a x ) y ) z = a x y z \large a = ((a^x)^y)^z = a^{xyz} .

Take the logarithm of both sides ln a = x y z ln a ln a ln a = x y z x y z = 1 \large \ln a = xyz\ln a \\ \large \dfrac{\ln a}{\ln a} = xyz \\ \large \boxed{xyz = 1}

a^x =b

b^y=c

c^z=a

we can substitute a=c^z , c^{xz}=b

and again we can substitute b^y=c

then we get, b^{xyz}=b

If both bases are equal,then the powers also equal.

from that xyz=1 this is final solution.

Mathh Mathh
Jun 17, 2014

If a b c = 0 abc=0 , we have that x y z xyz is any number you like (except 0 0 ), hence this problem does not have a unique answer. Everything would be alright, though, if the condition a b c 0 abc\neq 0 were added (Micah Wood's solution would follow).

Thanks, I have added in that condition.

Calvin Lin Staff - 6 years, 10 months ago
Azadali Jivani
Aug 11, 2015

a = c^z = b^(yz) = a^(xyz)
a = a^(xyz)
Therefore xyz=1 (Ans.)

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