exam Maths Puzzle Numerical Ability

Stanbon, this isnt a math question but how do I become smart like you and the other tutors? You seem to know how to get the answers with accuracy. How can I do this for my upcoming quiz?

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exam Other Question

finding square root
1/4(x+1)²-16=0
I would like to know how to solve this x+1/x-3>=1