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Question: Which of the following polynomial functions has the leading coefficient 2, degree 3, with - 2, 1 and 4 as real zeros?


A ) f (x) = 2 x3 + 6x2 + 12x + 16
B ) f (x) = 2 x3 + 6x2 - 12x - 16
C ) f (x) = 2x3 - 6x2 - 12x + 16
D ) f (x) = x3 + x2 + 2x + 6

Steps to derive

1 The polynomial function with leading coefficient 2, degree 3 with - 2, 1 and 4 as real zeros is f (x) = 2 (x + 2) (x - 1) (x - 4).

2 = 2 (x + 2) (x2 - 5x + 4)

3 f (x) = 2x3 - 6x2 - 12x + 16.



Hence the right answer is Option C

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