also I’m pretty Sure there are no mistakes for everything up until the 4th power term[I backed up my answer by Solving for y” and then differentiating 1 and 2 times respectively]

I cannot see the steps clearly. I'm sure it's not caused from you. Is there any way to see clearly? or Could you share it with high resolution, if there is this type of option. If not THANKS FOR ALL again... I'm appreciate.

I am unable to answer this lolx i am also so weak in mathematics and was trying to find the solution of this problem and now i got it from here.

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I’m not sure if I’m wrong though

Do you know any way to check the answer to this question, cause I think i got this