Express it in Qbasic expression

x = (-b + sqr(b * b - 4 * a * c)) / (2 * a)

x2 = (-b - sqr(b * b - 4 * a * c)) / (2 * a)

Usually when squaring a number I just use multiply it by itself like above.  If you actually want to use the exponent 2, then it would instead be:

x = (-b + sqr(b ^ 2 - 4 * a * c)) / (2 * a)

x2 = (-b - sqr(b ^ 2 - 4 * a * c)) / (2 * a)

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credit to ace:  

batradivjyot25.