x2 + 6x + 9
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Factor x2 + 6x + 9.
x2 + 3x + 3x + 9
Rewrite 6x as 3x + 3x, as 3 • 3 = 9, the last term, and 3 + 3 = 6, the middle term.
(x2 + 3x) + (3x + 9)
Group pairs of terms.
x(x + 3) + 3(x + 3)
Factor x out of the first pair, and factor 3 out of the second pair.
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