Question

From the product of (x-2y +1)(x-2y), subtract theproduct(x+y+1) (x-2y) and then evaluate it for x = -2 and y = -1​

Answer 1

Answer:

2

Step-by-step explanation:

=(x-2y+1)(x-2y)-(x+y+1)(x-2y)

=(x^2-2xy-2xy+4y^2+x-2y)-(x^2-2xy+xy-2y^2+x-2y)

=x^2-4xy+4y^2+x-2y-x^2+2xy-xy+2y^2-x+2y

=-2xy+6y^2

Now putting x=-2 and y=-1

-2(-2)(-1)+6(-1)(-1)

=-2(2)+6(1)

=-4+6

= 2