Question

Given the function f(x) = −2x + 8, find x if f(x) = 14

−20

36

−3

−11

Answer 1

well
if f(x) = 14
then
f(x) = -2x +8
14 = -2x + 8
14 - 8 = -2x
6 = -2x
6/-2 = x
-3 = x

So, x = -3

Answer 2

we put 14 instead of f(x):\[14=-2x+8 =>-2x=6=>x=-3\]
hope it helps you.