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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)

Respuesta :

Answer:

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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