(a+5)(b-7)=ab-7a+5b-35;
(3x-5)(2x+7)=6x²+21x-10x-35=6x²+11x-35;
(a-3)(a+4a+2)=a²+4a²+2a-3a-12a-6=5a²-13a-6;
(4x-3y)²=16x²-24xy+9y².
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(a+5)(b-7)=ab-7a+5b-35;
(3x-5)(2x+7)=6x²+21x-10x-35=6x²+11x-35;
(a-3)(a+4a+2)=a²+4a²+2a-3a-12a-6=5a²-13a-6;
(4x-3y)²=16x²-24xy+9y².