section+9.4+-+more+difficult+trinomials

__** Factoring ax^2+bx+c **__

^ followed by a number represents an exponent

__//**A-C method for Factoring:**//__ 1) Arrange in descending order 2) Multiply "a" and "c" and find factors that add to the middle term "b" 3) Rewrite middle term as 2 terms and group

Review:

//Factor- x^2+11x+30// //(x+ 5 ) (x+ 6 )

__30__ 1--30 2--15 -3--10 5--6

ex. 2x^2 +13x+ 15 // 2x^2+3x +10x+15 x( 2x+3 )+5( 2x+3 ) = (2x+3)(x+5) Use F.O.I.L. to check answer

__30__ 1---30 2---15 3---10 5---6

ex2. 6a^2 +1a -12 6a^2-8a +9a-12 2a( 3a-4 )+3( 3a-4 ) = (a+2)(3a+2)

__-72__ 1--72 2--36 3--24 4--18 6--12 -8--9

ex3. 3a^2 +8a+ 4 3a^2+2a +6a+4 a( 3a+2 )+2( 3a+2 ) = (a+2)(3a+2)

__12__ 1--12 2--6 3--4