无法将负数提高到小数幂

Question

x1 = -b + (b **2 - 4*a*c) ** 0.5
x2 = x1 / (2 * a)

My program takes user input and solves the quadratic function. However it is unable to process negative numbers, and I get the fractional power error. I want to know how to make it so that my program can accept negative numbers and still give correct answers.

I tried following but it doesn't give me an output, just blank lines:

x1 = -b + (b **2 - 4*a*c+0j) ** 0.5
x2 = x1 / (2 * a)

Answer 1

you should work with complex numbers for this purpose use cmath:

import cmath
x1 = -b + cmath.sqrt(b **2 - 4*a*c)
x2 = x1 / (2 * a)