Doubt from binomial theorem

ques 4

@Ajay_2020_1 @Sneha_2021 @akash_2020 @Satyendra_2019 anyone

\left(x^2+\frac{4}{x^2}+3 \right) ^5=(t+3)^5
Expand in terms of t and then expand t in terms of x
Also there is another method so called multinomial theorem.
I don't know much about that. @Achyut_2020

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Answer is b 110image

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Yes @Manu_2020

Alternate approach:

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