Question

Simplify the following expression completely. 

Answer 1

12a² - 3b² = 3(2a +b)(2a-b)
2a²-ab-b² = 2a(a-b)+b(a-b)
3(2a +b)(2a-b)
2a(a-b)+b(a-b)
 =3(2a-b)
     a-b
= ^3(2a-b)/_a-b