(x-2)(x+7)-2(3-x)(2+x)

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(x-2)(x+7)-2(3-x)(2+x)
(x-2)(x+7)-2(3-x)(2+x)

(x-2)(x+7)-2(3-x)(2+x)
x+5x-14-2(6+5x-x)
= x+5x-14-12-10x+2x
=3x-5x-26

多年辛苦

(x-2)(x+7)-2(3-x)(2+x)=3x^2-7x-26=(3x-13)(x+2)

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