ex: 2x2 + 6bx + 5x + 15b Group 1st 2 terms and last 2 terms. Factor separately.
=
(2x2 + 6bx) + (5x + 15b) Factor using gcf
=
2x(x + 3b) + 5(x + 3b) notice the parenthesis are the same
=
(2x + 5)(x + 3b)
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Common factors are always odd numbers
(a + b)(r + s)
The grouping of the factors of w^2 + 30w + 81 (a perfect square) is (w + 27) and (w + 3)3 is a prime factor of 27, 30 and 81 but without two terms to compare, there won't be a GCF (not gfc)
A factor that is a square number. 16 is a square factor of 32.
If you mean prime factor, it's 37.