Question

Which function is the inverse of f(x) = 2x + 3? mc013-1.jpg mc013-2.jpg f-1(x) = –2x + 3 f-1(x) = 2x + 3

Answer 1

f(x) = 2x + 3

Bring 3 to the left

f(x) = y

Now :

y - 3 = 2x

Divide both sides by 2

x = (y - 3)/2

Now we can write this as :

f⁻¹(y) = (y - 3)/2

Answer 2

f⁻¹(x) = ¹/₂ x - ³/₂

or option A on edge