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= x²+x-2x-2
= x²-x-2
(2x+3) (x-6) = ...
= 2x²-12x+3x-18
= 2x²-9x-18
⇔x²+2x-1x-2
⇒x²-x-2
(2x+3) (x-6)
⇒2x²+3x-12x-18
2x²-9x-18