(5a-4b)2 - (3a-b)(7a-16b)

Question

(5a-4b)2 - (3a-b)(7a-16b)

Answer 1

(25a2-40ab+16b2)-(21a2-48ab-7ab+16b2)=25a2-40ab+16b2-21a2+48ab+7ab-16b2=4a2+15ab

Comments

Спасибо!)