OpenStudy (anonymous):

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

5 years ago
jimthompson5910 (jim_thompson5910):

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

5 years ago