分解因式m^2+2m-6n-9n^2=

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分解因式m^2+2m-6n-9n^2=分解因式m^2+2m-6n-9n^2=分解因式m^2+2m-6n-9n^2=m^2+2m-6n-9n^2=m^2-9n^2+2m-6n=(m+3n)(m-3n)+

分解因式m^2+2m-6n-9n^2=
分解因式m^2+2m-6n-9n^2=

分解因式m^2+2m-6n-9n^2=
m^2+2m-6n-9n^2
=m^2-9n^2+2m-6n
=(m+3n)(m-3n)+2(m-3n)
=(m-3n)(m+3n+2)

m^2+2m-6n-9n^2
=m²+2m+1-(9n²+6n+1)
=(m+1)²-(3n+1)²
=(m+3n+2)*(m-3n)