How do you factor completely $3x^2 + 12x + 9$ ?

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Answer 1 · 2016-06-17T08:01:22

3(x+1)(x+3)

3x^2+12x+9
=3(x^2+4x+3)
Use{ cross product method}
1 3
1 1
x^2+4x+3=(x+1)(x+3)
So
3(x+1)(x+3)#

How do you factor completely 3x^2 + 12x + 93x^2 + 12x + 9?