# Which polynomial is a perfect square trinomial?

36x2 − 18x − 9

4a2 − 28a − 49

25b2 − 40b + 16

4x2 − 6x + 9

## Answers

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Answered by

jimmyrepin25b^2 - 40b + 16 = (5b - 4)(5b - 4) so its the third choice