Question

упростите выражение (3a-b)^2-(a^2+2b^2)

Answer 1

(3a-b)^2-(a^2+2b^2)=9а²-6ab+b²-a²-2b²=8a²-6ab-b²

Answer 2

(3a-b)²-(a²+2b²)=9a²-6ab+b²-a²-b²=8a²-6ab=2a(a-3b)