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14 November, 11:10

Factor 4a2 - 25.

A. (2a + 5) (2a + 5)

B. (2a - 5) (2a - 5)

C. (2a - 5) (2a + 5)

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Answers (1)
  1. 14 November, 11:26
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    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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