Question

(а+3b)²-(3а+b)²
Разложите на множители

Answer 1

a²+6ab+9b²-9a²-6ab-b²=8b²-8a²=8(b+a)(b-a)

Answer 2

(a^2+6ab+9b^2)-(9a^2+6ab+b^2)=a^2+6ab+9b^2-9a^2-6ab-b^2= -8a^2+8b^2