Question

Which function is the inverse of f(x) = 2x + 3?

f-1 (x)=-1/2x-3/2
f-1 (x)=1/2x-3/2
f-1 (x)=-2x+3
f-1 (x)=2x+3​

Answer 1

Answer:Since g(f(x))=x g ( f ( x ) ) = x , f−1(x)=2x+6 f - 1 ( x ) = 2 x + 6 is the inverse of f(x)=12x−3 f ( x ) = 1 2 x - 3 .

Explanation:

The function: f(x) 2x+3

Put "y" for "f(x)": y 2x+3

Subtract 3 from both sides: y-3 2x

Divide both sides by 2: (y-3)/2 x

Swap sides: x (y-3)/2