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26 July, 14:39

For f (x) = 2x + 8, find x when f (x) = - 7.

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  1. 26 July, 17:52
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    -7 = 2x + 8

    Solve for x. First subtract 8 to both sides.

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

    -15 = 2x

    Divide by 2.

    -15 / (2) = - 2x / (2)

    x = - 15/2 = - 7.5
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