exam Maths Puzzle Numerical Ability

(0.4x^2y^4)^2

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exam Other Question

Can you please help me with this problem? I am a little slow so you will need to break it down step by step. Thank you so much.
The square root of x^2 to the third power =9
Can you show me the steps to expand and solve

{{{3sqrt2(sqrt2+1)}}}