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