Question

Factor completely
9x2 + 9x -28

Answer 1

I use the decomposition method, where you multiply the coefficient of the first term (9) with the last term (-28) to get -252. Then try to look for 2 numbers that multiply to -252 and add up to get the middle term (9). If there aren't numbers that fit in with this rule, then it should be unfactorable.

Answer 2

There isn't an option to call it unfactorable and I couldn't find 2 numbers that add/multiply to them :/