Question

9m^2-n^2+3m-n

9m^2-n^2+3m-n
4x^2-y^2-2y-1
因式分解 要过程

Answer 1

9m^2-n^2+3m-n
＝(3m-n)*(3m+n)+(3m-n)
=(3m-n)*(3m+n+1)

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

Answer 2

9m^2-n^2+3m-n=(3m-n)(3m+n)+(3m-n)=(3m-n)(3m+n+1)

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