Presentation on theme: "Factoring Trinomials of the form ax2+bx+c with a =1."— Presentation transcript:
1Factoring Trinomials of the form ax2+bx+c with a =1. Dr. Marcia L. Tharp
2How to factor a trinomial of the form ax2+bx+c when a=1 To factor a trinomial means to write it as aproduct of two binomials.For example x2+6x+8= (x+2) (x+4) two binomialsRemember we can use F.O.I. L. to multiply out(x+2) (x+4) we get:ctoring trinomials is an importantAlgebraic skill. It is used in higher-level mathematics and science. Besides that you will need it to simplify some polynomial expressions and solve more complex equations.Adding the middle two terms you getX2+6x+8
3To get this trinomial into its factored form we use F. O. I. L To get this trinomial into its factored form we use F.O.I. L. in Reverse on x2+ 6x+8.Remember that the FIRST term x2 came from its factors x (x).So these two factors become thefirst terms in each binomial.Remember that the LAST term in each binomial came from factors of the LAST term 8 in x2+ 6x+8So 8 breaks down to 1(8) or 2(4). We need to choose which pair of factors 1 and 8 or 2 and 4 we want to become the last terms in each binomial
4To do this we look at the middle terms of x2+2x+4x+8. When we use F.O. I. L. to multiply theOUTSIDE and INSIDE terms in (X+2) (x+4)The inside and outside products are 2x and 4x. Their sum is 6x.So we are looking for factors of 8 (the constant term) that add to 6 to get the coefficient of the middle term inx2+ 6x+8.
5Lets make a table to organize what we know. We use a table to find two factors of 8 who sum to 6 the coefficient of the middle term in x2+6x+8.Factors of 8Sums of These Factors1 and 81+8=92 and 42+4=6So 2 and 4 have a sum of 6 and a product of 8.So these are the factors of 8 we use as the last terms of the binomial (x+__)(x+__).Therefore x2+6x+8= (x+2) (x+4)
6Interactive FOIL Exploration Print this page. First get the Live Math Plug in at:Be sure to download the plug in for your browser Internet Explorer or Netscape.Next click on the link to the Live Math Exploration and follow the directions in it.Finally click the back button on your browser to come back to this lesson. If for some reason this page does not work click back until you get to this presentation ignore the link and click past this page.
7Review To Factor A Trinomial ax2+bx+c when a=1 Print this page. 1) Factor x2 into x (x).2) Find two numbers who are factors of the last term (constant term), c, and whose sum equals the coefficient of the middle term (x-term) b.3) Use the two numbers found in the above step, including their signs, to write the trinomial in factored form. The trinomial in factored form will be:(X + a number) (X + a number)Now go on to the practice problems.