Question

Given the function f(x) = −2x + 4, find x if f(x) = 20.

Answer 1

If f(x) = −2x + 4 and f(x) = 20, then...


f(x) = −2x + 4

20 = −2x + 4 ... replace f(x) with 20 (since the two are equal, they are the same)


Now solve for x