Answer:
-2, 9
Step-by-step explanation:
Factor this expression:
[tex]x^{2} + 7x - 18[/tex]
We know that we need a factorization that multiplies to -18, and adds up to positive 7. Test all our combinations! Add them together and see if they equal 7.
-18 + 1 = -17 ≠ 7
-1 + 18 = 17 ≠ 7
-9 + 2 = -7 ≠ 7
-2 + 9 = 7
So we need to use -2 and 9!
[tex](x+9)(x-2)[/tex]
