[Solved] Keep getting math domain error [closed]

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As others said, you should call sqrt() only with proper values.

So better do

...

#Check discriminant

discrim = float((bval**2)-(4*aval*cval))

if float(discrim >= 0):
    # now it is ok to calculate the roots...
    root1 = - bval + math.sqrt(discrim)
    root2 = - bval - math.sqrt(discrim)

    if float(discrim > 0):
        print ("Roots at:", root1, root2)
    else:
        print ("Only one real root:", root1, root2)
else:
    print ("No real roots.")

This way we are sure we are allowed to call sqrt.

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solved Keep getting math domain error [closed]