Factoring x^2 +bx + c
Continued
"So FOIL stands for first, outer, inner, last, so to check (x+4)(x+9)
you simply follow that pattern".
Steps of foil:
1. Multiply the first term of each binomial together or the 2 x's this
gets us x^2.
2.Multiply the outer terms together or the 9 and the x to get 9x.
3.Multiply the inner terms together or the 4 and the x to get 4x.
4.Multiply the last terms together or the 4 and the 9 to get 36.
"Combine all of these and we get x^2 + 13x + 36 which is the origanal
problem so we are right." "Click here to try it."
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