a = (x+1)(x+1)
=(x+1)²
=x²+2x+1
b = ( -y-3)(3y+3)
=-3y²-3y-9y-9
=-3y²-12y-9
c= -(a+1)(a+1)
=-(a²+a+a+1)
=-a²-2a-1
d= -(-x-2)(2x+1)
=-(-2x²-1-4x-2)
=2x²+3+4x
e= (-4x-4)(3x+1)+(2x-2)(x+2)
=-12x²-4x-12x-4+2x²+4x-2x-2
=-10x²-14x-6
f= (-5a+2)(-2a-1)-(4a+1)(-2a+5)
=10a²+5a-4a-2-(-8a²+20a-2a+5)
=10a²+a-2+8a²-20a+2a-5
=18a²-17a-7
g= (y+2)(5y-5)-(3y+1)(-6y-6)
=5y²-5y+10y-10-(-18y²-18y-6y-6)
=5y²+5y-10+18y²+18y+6y+6
=23y²+29y-4
