Question

(7a-8b)^2-(4a-5b)(3a+2b)

Answer 1

$\(7a-8b)^2-(4a-5b)(3a+2b)= \49a^2-112ab+64b^2-12a^2-8ab+15ab+10b^2= \. \37a^2-105ab+74b^2$