Ex: Expand

3a(4a-3b)

=12a²-9ab

We also learnt how to simplify these expressions. To simplify an expression you, first, expand the expression like we have already done and then, secondly, collect like terms.

Ex: Expand and Simplify

4x(2x²+ 5x -3) –(2x²-7)

=8x³+20x²-12x-2x²+7

=8x³+18x²-12x+7

The final thing that we learnt to do today was multiplying binomials. When multiplying binomials you use the F.O.I.L. method. The F.O.I.L. method stands for multiplying the

**F**irst two terms, then multiplying the

**O**utside two terms, then multiplying the

**I**nside two terms, and, finally, multiplying the

**L**ast two terms.

Ex: Find the product of the binomials

(x+6)(x+8)

=x²+8x+6x +48 <----(F.O.I.L. method)

=x²+14x+48 <----( you have to collect like terms here too.)

The assignment for today was:

pg.107, questions 1-29 odd and pg.108, questions 32-43 and 45-67

## 2 comments:

Your use of examples made this post very easy to follow and understand, even for someone like myself who hasn't done any calculus for almost a year. It was a good refresher for me, and would be willing to link to this post if I were ever teaching pre-calc. to give students an overview on this lesson.

Nicole L. (Mentor) University of Regina, email: little1n@uregina.ca, blog: http://nicolelittle.wordpress.com

Well done Rob! Mrs. Remple

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