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19 May, 17:24

Given f (x) = 4x4 + 5x3 - 15x2 - 45, find f (-3).

A)

f (-3) = 3

B)

f (-3) = 6

C)

f (-3) = 9

D)

f (-3) = 12

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Answers (2)
  1. 19 May, 17:29
    0
    C)

    f (-3) = 9

    Step-by-step explanation:

    Given f (x) = 4x^4 + 5x^3 - 15x^2 - 45

    f (-3) means let x = - 3

    f (-3) = 4 (-3) ^4 + 5 (-3) ^3 - 15 (-3) ^2 - 45

    =4 (81) + 5 (-27) - 15 (9) - 45

    = 324 - 135 - 135 - 45

    =9
  2. 19 May, 17:30
    0
    The answer is C.
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