Question

Subtract a^2+b^2 from the sum of a^2+3ab-2b^2 and -3ab+b^2.

Answer 1

Solution :-

(a^2+3ab-2b^2)+(-3ab+b^2)-(a^2+b^2)

=>a^2+3ab-2b^2-3ab+b^2-a^2-b^2

=> -2b^2