Question

Given that f(x)=2x-5 and g(x)=x+3 find f-1(x)​

Answer 1

f(x)= 2x+5=y

so that y is the image of x under f .

now solve this equation for x as follows:

y = 2x+5

2x = y-5

x = y-5/2

: f-1(y) = 1/2 (y-5)

to find f-1(x), replace y by x.

f-1(x) = 1/2 (x-5)

SOLVED.