Posted by **math** on Monday, November 1, 2010 at 3:16pm.

Right answer?

15(x^2+3x) + 7(x^2+3x) - 5(x^2+3x)

15x^2+45x+7x^2+21x + 5(-x^2-3x)

15x^2+45x+7x^2+21x-5x^2-15x

17x^2+51x

- lomas -
**Henry**, Wednesday, November 3, 2010 at 4:46pm
x^2 + 3x is common to all terms. So we

factor it out:

(x^2 + 3x) (15 + 7 - 5),

(x^2 + 3x)17,

17(x^2 + 3x).

Factor your answer and it wil be identical to mine.

Alternate method:

Let (x^2 + 3x) = a,

15a + 7a - 5a = 17a,

17(x^2 + 3x).

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