Homework Help: Algebra

Posted by G on Tuesday, April 22, 2008 at 1:43pm.

Mutiplying a Binomial by a Trinomial

(FOIL) First, Outer, Inner, Last Method

(3X+2)(X-1)(X+3)

I have tried equation several times. The book says the answer is:

3X 3rd + 8X 2nd - 5X -6

I get:

12X 2nd - 6X + 3X 3rd -4

Not sure if i am doing it wrong or if error in the book.

Algebra - Reiny, Tuesday, April 22, 2008 at 1:49pm
multiply the first two binomials to get
(3x^2 - x - 2)(x+3)

now expand this to get
3x^3 + 9x^2 - x^2 - 3x - 2x - 6

collect like terms and simpify to get the answer that the book gave.

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