Question

1-y-xy+x9m^2-4n^2+4n-1(2a-b)^2+8ab3x^2y-7xy+4y

Answer 1

1-y-xy+x

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

=(1-y)(1+x)

9m^2-4n^2+4n-1

=(3m)²-(4n²-4n+1)

=(3m)²-(2n-1)²

=(3m+2n-1)(3m-2n+1)

(2a-b)^2+8ab

=4a²-4ab+b²+8ab

=4a²+4ab+b²

=(2a+b)²

3x^2y-7xy+4y

=y(3x²-7x+4)

=y(x-1)(3x-4)