Question

一道数学因式分解，求老师，学霸帮忙！谢谢！

3(a^2-27)-3/4a^2

Answer 1

3(a^2-27)-3/4a^2
=(1/4)x(12a^2-324-3a^2)
=(1/4）x(9a^2-324)
=(9/4)x(a+6)(a-6)

Answer 2

3（a²-27）-3/4a² =3a²-81-3/4a²=9/4a²-81= （3/2a-9）(3/2a+9)