7th

Dear student
Since the numbering is not visible so providing solution  as per my understanding.
Kindly refer the  link for your query.
(Refer Q2)
https://www.meritnation.com/ask-answer/question/urgent-ans-reqd-plz1-sachin-nd-rahul-attempt-to-solve-a/complex-numbers-and-quadratic-equations/7302731
Regards