If f(x) = 5 - 2x, then f -1(-3) = ?

If f(x) = 5 - 2x, then f -1(-3) = ?

Quiz

Answer/Solution

3

Steps/Work

Find f -1(x) and then Find f -1(- 3)
y = 5 - 2x , given
x = 5 - 2y , interchange x and y
2y = 5 - x , y = log2(5 - x) , solve for y
f -1(x) = log2(5 - x) , inverse function
f -1(- 3) = log2(5 + 3)
= log2(23) = 3
correct answer E

General Calculator / Auto Solver

If f ( x ) = - x, then f - ( - ) =?

Calculated Answer

3

Step by Step Solution

In order to solve problem, you must evaluate n0 - n1 * (n3 - n2) / n1.

n0 =5
n1 =2
n2 =1
n3 =3