x x x square + 5 x minus 2
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It is easy to check that the expression vanishes for x= -2- which means that x+2 is a factor.
3x² + 5x-2
= 3x² + 6x - x - 2
= 3x ( x - 2 ) - 1 ( x+2)
= ( 3x - 1 ) ( x +2 )
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Answer:
3x²-5x-12=0
3x²+4x-9x-12=0
x(3x+4)-3(3x+4)=0
(3x+4)(x-3)
x=-4/3
x=3
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