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23 June, 23:12

Given ƒ (x) = - 2x - 12, find x when ƒ (x) = 20.

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Answers (2)
  1. 23 June, 23:14
    0
    -16

    Step-by-step explanation:

    f (x) = - 2x - 12

    20 = - 2x - 12

    20 = - 2x

    +12

    32=-2x

    32=x

    :-2

    -16=x
  2. 23 June, 23:37
    0
    Step-by-step explanation:

    ƒ (x) = - 2x - 12

    f (20) = - 2 (20) - 12

    = - 40 - 12

    = - 52
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