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17 December, 17:48

For the function For the function f (x) = 2|5x+7|-1, evaluate f (-4).

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Answers (2)
  1. 17 December, 17:54
    0
    f ( - 4) = 25

    Step-by-step explanation:

    Note the absolute value function | a | always returns a positive value, that is

    | - a | = | a | = a

    Given

    f (x) = 2 | 5x + 7 | - 1

    To evaluate f ( - 4) substitute x = - 4 into f (x)

    f ( - 4) = 2 | 5 ( - 4) + 7 | - 1 = 2 | - 20 + 7 | - 1 = 2 | - 13 | - 1 = (2 * 13) - 1 = 26 - 1 = 25
  2. 17 December, 18:50
    0
    f (-4) = 25
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