I am a 10th grade student. I appeared in NSTC Screening Test last week and found this problem very difficult. I was unable to solve this. It opens to form a quartic equation. Please upload a video on YouTube for solving equations of this type.
I have plugged this equation in Wolfram Alpha but it requires money, and I don’t own a credit card. If any one has its membership please send me its solution by Wolfram Alpha.