exam Maths Puzzle Numerical Ability

What is the square root of 400t?

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exam Other Question

I need to solve for x. I believe the answer if 4 but I have no idea how to start.
(2x-3/x-1)-(x-1/x+2)=(2x-5/x+2)+(2-x/1-x) solve by using the quadratic formula and write your answeres in radical form.
x^2=-5x-5