(x+y)(a+2b)
=xa+2xb+ay+2by
(2a+3)(2/3b+5)
=4a/3b+10a+2/b+15
(2x+3)(-x-1)
=-2x^2-2x-3x-3
=-2x^2-5x-3
(-2m-1)(3m-2)
=-6m^2+4m-3m+2
=-6m^2+m+2
(x-y)^2
=x^2-2xy+y^2
(-2x+3)^2
=4x^2-12x+9
(x+y)(a+2b)
=xa+2xb+ay+2by
(2a+3)(2/3b+5)
=4a/3b+10a+2/b+15
(2x+3)(-x-1)
=-2x^2-2x-3x-3
=-2x^2-5x-3
(-2m-1)(3m-2)
=-6m^2+4m-3m+2
=-6m^2+m+2
(x-y)^2
=x^2-2xy+y^2
(-2x+3)^2
=4x^2-12x+9