Why it is showing error

@chaman_31599,

Are you attempting the “Revising Quadratic Equation” question? Because the code you have attached is of some other question.

I hope I’ve cleared your doubt. I ask you to please rate your experience here
Your feedback is very important. It helps us improve our platform and hence provide you
the learning experience you deserve.

On the off chance, you still have some questions or not find the answers satisfactory, you may reopen
the doubt.