SOLUTION: how would i factor this problem? (13x^2-56x-135)

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Question 594465: how would i factor this problem? (13x^2-56x-135)
Answer by scott8148(6628) About Me  (Show Source):
You can put this solution on YOUR website!
13 is a prime number - no factors except 1 and 13

one of the factors of -135, plus the other factor of 135 multiplied by 13; have to sum to -56

factors for -135 (one of the pair must be negative) ___ (1,135), (3,45), (5,27), (9,15)

none of the pairs of possible factors work, so the expression is not factorable
___ you can confirm this by using the quadratic formula