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22 July, 03:05

21x3 - 9x2 - 28x + 12

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Answers (1)
  1. 22 July, 06:02
    0
    (7x-3) (3x^2 - 4)

    Step-by-step explanation:

    21x^3 - 9x^2 - 28x + 12

    We can factor by grouping

    Factor out 3x^2 from the first two terms and - 4 from the last two

    21x^3 - 9x^2 - 28x + 12

    3x^2 (7x-3) - 4 (7x-3)

    Now factor out (7x-3)

    (7x-3) (3x^2 - 4)
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