SOLUTION: Trying to factor -18a^2 + 17a + 15. All I can get at this point is multiplying -18 with 15 equals -270.

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Question 495330: Trying to factor -18a^2 + 17a + 15. All I can get at this point is multiplying -18 with 15 equals -270.
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
Try this:
-18a%5E2+%2B17a%2B15 FIrst factor a -1.
-%2818a%5E2-17a-15%29
What are the factors of 18?
1*18 = 18
2*9 = 18
3*6 = 18
And what are the factors of 15?
1*15 = 15
3*5 = 15
I would start with 2*9 and 3*15 but you can start with any pairs from both groups and check your solutions..
-%2818a%5E2-17a-15%29+=+-%282a-3%29%289a%2B5%29