5(m²-2mn+n²)= 5(m-n)²= 5(56-44)²=5*12²=5*144= 720
-a(64a²+8ab+1/4b²)= -a(8a+1/2b)= 6*(8*(-6)+84/2)= 6*(-48+42)= 6*(-6)= -36
5(m²-2mn+n²)= 5(m-n)²= 5(56-44)²=5*12²=5*144= 720
-a(64a²+8ab+1/4b²)= -a(8a+1/2b)= 6*(8*(-6)+84/2)= 6*(-48+42)= 6*(-6)= -36