Question

Упростите выражение (3а-5)^2-(3a+5)^2 .

Answer 1

$=(3a-5-3a-5)(3a-5+3a+5)=-10*6a=-60a$

Answer 2

(3а-5)^2-(3a+5)^2=((3a-5)-(3a+5))*((3a-5)+(3a+5))=(3a-5-3a-5)*(3a-5+3a+5)=(-10)*(6a)=-60a