SOLUTION: factor the polynomials. x^2+ x-20

Question 213941: factor the polynomials.
x^2+ x-20
Answer by drj(1380) (Show Source): You can put this solution on YOUR website!
Factor the polynomials.

Note we need to find two numbers A and B such that A*B=-20 and A+B=1. After trial and error like A=1, B=-20 or A=2 and B=-20 the numbers that satisfy these relationships are A=5 and B=-4.

where .

We can check our factoring by using the FOIL method as well.

I hope the above steps were helpful.

For FREE Step-By-Step videos in Introduction to Algebra, please visit http://www.FreedomUniversity.TV/courses/IntroAlgebra and for Trigonometry visit http://www.FreedomUniversity.TV/courses/Trigonometry.

Good luck in your studies!

Respectfully,
Dr J
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