KEVIN B.

# what is the product. ( x-9)(x+8)

Find  the product. (X-9)(x+8)

## 2 Answers By Expert Tutors

By:

Tutor
4.8 (4)

Mathematics professor at Community Colleges

Tutor
4.9 (116)

My goal is the success of my students. Knowledge-Patience-Honesty

KEVIN B.

Thank you Jason I really appreciate it
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11/18/13

Parviz F.

I just think  this the FILE method is very useless formula to memorize , and confuse.

The method  that I gave  has application  in factoring quadratic , Trinomial to product of  2 binomial.

( X + a) ( X +b ) = X2 +( a + b) X + ab

Which is used in solution of quadratic equations, and when a quadratic is favorable, and when it has irrational and complex roots.
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11/18/13

Jason S.

You are most welcome Kevin.

Parviz,

FOIL is extremely effective, in my years of experience, in helping students to remember why the following works:

(ax + b) (cx + d) = (ac)x^2 + (ad)x + (bc)x + bd =

ac is first
bc is inside
bd = outside

The words make much more sense to the students than the complicated formula, in my experience.
Report

11/19/13

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