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23 July, 08:03

If f (3) = 15 and f (5) = 45, which of the following could be f (x) ?

a. 4x + 3

b. 2x² - 2x

c. 2x² - x

d. 2x² - 5

e. 5x²

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Answers (1)
  1. 23 July, 08:10
    0
    F (x) = 2x² - x

    f (3) = 2 (3) ² - 3

    f (3) = 2 (9) - 3

    f (3) = 18 - 3

    f (3) = 15

    f (x) = 2x² - x

    f (5) = 2 (5) ² - 5

    f (5) = 2 (25) - 5

    f (5) = 50 - 5

    f (5) = 45

    The answer is C.
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