(2x-3)(2x+3)=4x²-9
(3x-1)²=9x²-6x+1
(-2x)(3x²-2x+1)=-6x³+4x²-2x
(2x-3)(3x+2)=6x²+4x-9x-6=6x²-5x-6
(x-2)(x+2)(x²+4)=(x²-4)(x²+4)=x⁴-16
(2x-3)(2x+3) (3x-1)^2 （-2X）(3X^2-2X+1) (2X-3)(3X+2) (X-2)(X+
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