(6a-7)(7+6a)+(7-8a)(8+7a)=. Created by lordbin. algebra-ru

(6a-7)(7+6a)+(7-8a)(8+7a)=...

Sp1keazyYT $(6a-7)(7+6a)+(7-8a)(8+7a)=42a+36a^2-49-42a+56+ \\ +49a-64a-56a^2=-20a^2+7-15a$

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hoce (6а – 7)(7 + 6а) + (7 – 8а)(8 + 7а) = (6а – 7) × (6а + 7) + 56 + 49а – 64а – 56а² = 36а² – 49 + 56 + 49а – 64а – 56а² = – 20а² + 7 – 15а = – 20а² – 15а + 7

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