# algebra

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For the function f(x)=(7-8x)^2, find f^-1. Determine whether f^-1 is a function.

• algebra -

it's clear that the inverse is not a function, since there are a positive and negative value for x that give the same value for y.

y = (7-8x)^2
±y = 7-8x
8x = 7±y
x = (7±y)/8

• algebra -

thanks

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