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16 February, 03:16

What is the range of f (x) = 3x + 9?

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  1. 16 February, 07:09
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    Answer: - 21, - 18, - 9, - 6, 15

    Explanation:

    The range is all the values the function can achieve by using x in from its domain, so we just plug in all the numbers in the domain here;

    f (-4) = 3 (-4) - 9 = - 12 - 9 = - 21

    f (-3) = 3 (-3) - 9 = - 9 - 9 = - 18

    f (0) = 3 (0) - 9 = 0 - 9 = - 9

    f (1) = 3 (1) - 9 = 3 - 9 = - 6

    f (8) = 3 (8) - 9 = 24 - 9 = 15

    So the range is the set {-21, - 18-, - 9, - 6, 15}
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