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    if not isinstance(a,(int, float)):

        raise TypeError('bad operand type')

    if not isinstance(b,(int, float)):

        raise TypeError('bad operand type')

    if not isinstance(c,(int, float)):

        raise TypeError('bad operand type')

    if b**2-4*a*c >=0:

        x1 = (-b + math.sqrt(b**2-4*a*c))/(2*a)

        x2 = (-b - math.sqrt(b**2-4*a*c))/(2*a)

        return(x1,x2)

    else:

        raise TypeError('bad operand type')

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