Which is a factor of 144 minus 49 x squared ?

Recognize 144 − 49x² as a difference of squares: 144 = 12² and 49x² = (7x)². So 144 − 49x² = (12 − 7x)(12 + 7x), making 12 − 7x a factor. The correct choice is B, “12 minus 7x.”

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