解方程：m²-m-7=-1

解方程：m²-m-7=-1
解方程：m²-m-7=-1

解方程：m²-m-7=-1
m²-m-7=-1
m²-m-7+1=0
m²-m-6=0
(m-3)(m+2)=0
m1=3 m2=-2

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m²-m-7=-1
m^2-m-6=0
(m-3)(m+2)=0
m-3=0 m+2=0
m=3 m=-2

m²-m-7=-1
m²-m-6=0
(m-3)(m+2)=0
(m-3)=0
m=3
(m+2)=0
m=-2

m²-m-6=0
(m-3)（m+2）=
则m-3=0或m+2=0
则m1=3 m2=-2
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