(2a-3b)(7a+4b)-(3,5+b)(4a-6b)

Question

(2a-3b)(7a+4b)-(3,5+b)(4a-6b)

Answer 1

..............=14а²+8ab - 21ab - 12b² - 14a+21b-4ab+6b²=14a² - 17ab - 6b² - 14a +21b