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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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