1.(-2a? b)? (-3ab? )? =-8a^6b^3*9a^2b^6=-72a^8b^9
2.-2ab(a-2)? =-2ab(a^2-4a+4)=-2a^3b+8a^2b-8ab
3.(x+ 1)(x? -x+ 1)=x^3+ 1
4.(5a-4b)? -2(5a-4b)(3a-2b)=25a^2-40ab+ 16b^2-2( 15a^2-22ab+8b^2)=-5a^2+4ab
2. Break down the following categories
5.4a? - 16=(2a+4)"(2a-4)
6.4x? y+ 12xy+9y=y(2x+3)^2
7.m? (m+ 1)-(m+ 1)=(m+ 1)^2(m- 1)
8.(a? )? -2a? b? +(b? )? =(a^2-b^2)^2=(a-b)^2(a+b)^2