2 years ago

Factor 4a2 - 25. A. (2a + 5)(2a + 5) B. (2a - 5)(2a - 5) C. (2a - 5)(2a + 5)

1 answer:

3 0

This is the diference of 2 perfect squares. 4 is a perfect square, x^2 is a perfect square, and 25 is a perfect square. The pattern for this is (ax + b)(ax - b). Our a is 2 since 2*2 = 4, and our b is 5 since 5*5 = 25. So your factors are (2a+5)(2a-5), choice C.

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