Question

4xy-(x2-4y2)怎么因式分解

Answer 1

4xy-x^2+4y^2

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

=(x+2y)^2-(√2x)^2

=(x+2y-√2x)(x+2y+√2x)

=[(1-√2)x+2y][(1+√2)x+2y]