(superspeed) solve the quadratic equation of one variable x2 + 2mx + 2 = 0 with respect to x, and point out the value of M2

(superspeed) solve the quadratic equation of one variable x2 + 2mx + 2 = 0 with respect to x, and point out the value of M2

x2+2mx+2=0
(x+m)^2=m^2-2
When m ^ 2-2 > = 0, that is m ^ 2 > = 2, the equation has a solution
The solution is:
X1 = - M + radical (m ^ 2-2)
X1 = - m-radical (m ^ 2-2)