Since the first and the last term happen to be perfect squares, you can take the square root of each, and check whether the linear term (the central term) happens to be twice the first term, times the last term. In this case it is.
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6x(1+4)
3v2 + 9v = 3v (v + 3)
The factorization of 25x2 + 40x + 16 is (5x+4)(5x+4).
x + 12x + 20 = (x + 10)(x + 2)
(-4x + 3)(x - 2)Apex :)!!