Determine which polynomial is a perfect square trinomial.

49x2 − 28x + 16
9a2 − 30a + 25
25b2 − 45b − 81
16x2 − 24x − 9

is it b pls help me

1 answer

3 times 5 is 15 and 15+15 = 30 so try the second one

(3a-5)((3a-5)