(a+b){2}-(a-b){2}=4ab

Question

(a+b){2}-(a-b){2}=4ab

Answer 1

Как (a+b)^2=a^2+2ab+b^2, то 64=a^2+b^2+4,

Comments

это ответ

Answer 2

(a+b)²-(a-b)²=4ab
a²+2ab+b²-(a²-2ab+b²)=4ab
a²+2ab+b²-a²+2ab-b²=4ab
4ab=4ab