Algebra
posted by G on .
Mutiplying a Binomial by a Trinomial
(FOIL) First, Outer, Inner, Last Method
(3X+2)(X1)(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.

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.