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OpenStudy (anonymous):
Determine which polynomial is a perfect square trinomial. 25x2 − 40x − 16 9a2 − 20a − 25 25b2 − 15b + 9 16x2 − 56x + 49
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OpenStudy (anonymous):
Answer: 16x2 − 56x + 49 [since: -2ab=-2(4x)(7)=-56x] (the problem with 25x^2-40x-16 is the sign on the constant; it should be positive on a perfect square trinomial like these)
OpenStudy (saifoo.khan):
D. (7-4x)^2
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