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2.3x²+23x-14
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= (6x-4x) (-5y-(-3y))
= 2x - 2y
b. (-3x+2) (x-7)
= (-3x.x)+(-3x.-7)+(2.x)+(2.-7)
= -3x² + (-21x) + 2x +(-14)
= -3x² + (-19x) + (-14)
= -3x² - 19x - 14