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5 May, 17:54

If x = - 2 is a zero of the polynomial function f (x) = 2x3 + 9x2 - 8x - 36, which of the following is another zero of f (x) ?

Select one:

a. x = 8

b. x = 4

c. x = 3

d. x = 2

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Answers (1)
  1. 5 May, 17:57
    0
    F (x) = 2*x^3 + 9x^2 - 8x - 36

    = 2x (x^2 - 4) + 9 (x^2 - 4)

    = (2x + 9) (x^2 - 4)

    = (2x + 9) (x-2) (x+2)

    x = 2, - 2, - 9/2

    ans. = d. x=2
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