can i get help how to know a number imaginary or not

Question

wel i m try to use
sqrt(d*d-4*a*c)
so if my d*d<4*a*c
that become imaginary number and i didn't get what i want
i put random number so with condition like if d > 0
or d= 0
but if it got imaginary it didn't show anything
it shows error in sqrt
https://code.sololearn.com/cgjL3AQMFYvy/?ref=app

Answer 1

Is it math.sqrt()? It does not allow negative numbers. But you can get an imaginary number by raising it by the power of 2

https://code.sololearn.com/c0R2lr77RQ2Q/?ref=app

Answer 2

d = b*b-4*a*c this is the value you need to compare with 0 to find out the number and type of solutions.
You need the sqrt(d) if you need to calculate the solutions.
For the case when d is negative you can use sqrt from the cmath module.