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16 November, 21:02

Given ƒ (x) = - 10x + 45, find x when ƒ (x) = 15.

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  1. 16 November, 21:17
    0
    x = 3

    Step-by-step explanation:

    Given

    f (x) = - 10x + 45 and f (x) = 15, then equating gives

    - 10x + 45 = 15 (subtract 45 from both sides)

    - 10x = - 30 (divide both sides by - 10)

    x = 3
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