Question

(3ab - 62a) + (a² - 4ab + 2b²) + (5a² - 3b²)

Answer 1

(3ab+62a)+(a^2-4ab+2b^2)+(5a^2-3b^2)=
3ab+62a+a^2-4ab+2b^2+5a^2-3b^2=
-ab-62a+6a^2-b^2