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17 January, 13:52

Find the zeros of the following polynomial p (x) = 3x³ + 9x² - 12x

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  1. 17 January, 14:01
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    x = - 4, x = 0, x = 1

    Step-by-step explanation:

    To find the zeros equate p (x) to zero, that is

    3x³ + 9x² - 12x = 0 ← divide through by 3

    x³ + 3x² - 4x = 0 ← factor out x from each term

    x (x² + 3x - 4) = 0

    x (x + 4) (x - 1) = 0 ← in factored form

    Equate each factor to zero and solve for x

    x = 0

    x + 4 = 0 ⇒ x = - 4

    x - 1 = 0 ⇒ x = 1
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