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Mathematics 20 Online
OpenStudy (anonymous):

Determine which polynomial is a perfect square trinomial. A. 25x^2 − 40x − 16 B. 9a^2 − 20a − 25 C. 25b^2 − 15b + 9 D. 16x^2 − 56x + 49

OpenStudy (hoblos):

16x^2 − 56x + 49 = (4x)^2 -2(7)(4x) + 7^2 = (4x-7)^2

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