Question

If f:X is 3x + b and ff(2) = 12, find the value of b​

Answer 1

`b =6`

Explanation:

Given

`f(x) =3x + b`

`f(2) = 12`

Required

Find b

`f(2) = 12` implies that:

`12 = 3 * 2 + b`

`12 = 6 + b`

Collect like terms

`b = 12 - 6`

`b =6`