Question

a^2+2ab+3b^2-3a^2-4ab+b^2+2a^2-3ab+4b^2

Answer 1

=-5ab+8b^2
$$$$$$$$$$$$$$$$$$$$$$$$$=

Answer 2

а²+2ab+3b²-3a²-4ab+b²+2a²-3ab+4b²=(a²-3a²+2a²)+(2ab-4ab-3ab)+(3b²+b²+4b²)=-5ab+8b²