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18 October, 10:04

Find f (-5) if f (n) = n^3 + 3n^2?

A) - 50

B) - 7

C) 0

D) 22

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Answers (1)
  1. 18 October, 10:28
    0
    f (n) = n³ + 3n²

    To find f (-5), replace all n with - 5

    f (-5) = (-5) ³ + 3 (-5) ² = - 125 + 3 (25) = - 125 + 75 = - 50

    The answer is A) - 50
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