Which expression correctly factors the polynomial?
1 answer:
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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