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9 May, 11:07

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

6

48

14

8

+2
Answers (1)
  1. 9 May, 14:01
    0
    So since we are solving for x, put 20 instead of f (x):

    20 = 2 (x + 4)

    You can distribute 2 to x and 4:

    20 = 2x + 8

    Subtract both sides by 8:

    12 = 2x

    Divide both sides by 2

    6 = x
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