Posted by Lisa on Thursday, July 5, 2012 at 7:56pm.
1. Factor: x^2 - 2x - 3.
C = -3 = 1*(-3) = -1*3.
Select the pair whose algebraic sum = -2(1,and-3).
(x+1)(x-3).
The above method works best when the coefficient of x^2 is 1.
2. Factor: 2x^2 + x - 6.
The AC method should be used when the
coefficient of x^2 is not 1:
A*C=2*(-6) = -12 = -1*12 = -2*6 = -3*4.
Use the pair of factors whose algebraic
sum = B(1):
2x^2 + (-3x+4x) - 6.
Arrange the 4 terms to form 2
factorable binomials:
(2x^2+4x) + (-3x-6)
Factor each binomial:
2x(x+2) + -3(x+2)
(x+2)(2x-3).
These 2 methods take all of the guess work out of factoring.
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