Question

因式分解4(x-y+1)+y(y-2x)

Answer 1

4（x-y+1)+y(y-2x)
=4x-4y+4+y^2-2xy
=(y^2-4y+4)-2x(2-y)
=(y-2)^2+2x(y-2)
=(y-2)(2x+y-2)

Answer 2

4（X-Y+1)+Y(Y-2X)
=4X-4Y+4+Y²-2XY
=(2-Y)²+2X(2-Y)
=(2-Y)(2-Y+2X)