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13 December, 13:26

Which expression correctly factors the polynomial?

9x2 - 49

A. (3x - 7) ?

B. (3x - 7) (3x + 7)

C. (9x + 7) (x - 7)

D. (9x - 7) (x + 7)

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Answers (1)
  1. 13 December, 16:27
    0
    B

    Step-by-step explanation:

    9x² - 49 ← is a difference of squares and factors in general as

    a² - b² = (a - b) (a + b)

    Thus

    9x² - 49

    = (3x) ² - 7²

    = (3x - 7) (3x + 7) → B
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