SOLUTION: solve by factoring 6x^2 -21x -12= 0

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Question 474223: solve by factoring 6x^2 -21x -12= 0
Answer by edjones(8007) About Me  (Show Source):
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6x^2 -21x -12= 0
6*-12=-72, Two factors of -72 whose sum is -21 are -24 and +3
6x^2+3x-24x-12=0
3x(2x+1)-12(2x+1)=0
(3x-12)(2x+1)=0
3x=12, 2x=-1
x=4, x=-1/2
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Ed