Question 139933
m^2+6m-9=0
m^2+6m  =9
m^2+6m+9=9+9 completing the square by dividing the 2nd term by 2 and squaring the result.
(m+3)^2=18
m+3=+-sqrt(9*2)
m=-3+3sqrt(2), m=-3-3sqrt(2)
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Ed