Question

Find f ^−1(x) for the function.

Answer 1

Answer: $\frac{-7x}{x-1} or \frac{7x}{1-x}$

Step-by-step explanation:

you do this by swapping x and y values

so it becomes x = y/(y+7)

cross-multiply to get

x(y+7) = y

xy + 7x = y

xy - y = -7x

y(x-1) = -7x

y = -7x/(x-1)

y = $\frac{-7x}{x-1} or \frac{7x}{1-x}$