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8 January, 10:07

Find f (-7) if f (x) = 2 х + 8.

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Answers (2)
  1. 8 January, 10:17
    0
    f (-7) = - 6

    Step-by-step explanation:

    Put x = - 7 to f (x) = 2x + 8:

    f (-7) = 2 (-7) + 8 = - 14 + 8 = - 6
  2. 8 January, 10:34
    0
    use the substitution method

    f (x) = 2x+8

    f (-7) = 2 (-7) + 8

    Mutiply first then add

    Positive number times negative number = negative number

    = - 14+8

    f (-7) = - 6

    Answer : f (-7) = - 6
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