Question

(3а-5)^2-(3а+5)^2
А=1/30
Помогите

Answer 1

(3а-5)²-(3а+5)²=((3а-5)+(3а+5))((3а-5)-(3а+5))=(3а-5+3а+5)(3а-5-3а-5)=
=6а*(-10)=-60а=$-60* \frac{1}{30} =-2$