若m^2+n^2=6n-4m-13,则m^2-n^2=

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若m^2+n^2=6n-4m-13,则m^2-n^2=若m^2+n^2=6n-4m-13,则m^2-n^2=若m^2+n^2=6n-4m-13,则m^2-n^2=m^2+n^2=6n-4m-13m^2

若m^2+n^2=6n-4m-13,则m^2-n^2=
若m^2+n^2=6n-4m-13,则m^2-n^2=

若m^2+n^2=6n-4m-13,则m^2-n^2=
m^2+n^2=6n-4m-13
m^2+4m+4+n^2-6n+9=0
(m+2)^2+(n-3)^2=0
{m+2=0
n-3=0
∴{m=-2,n=3
m^2-n^2=4-9=-5