exam Maths Puzzle Numerical Ability

what is radical 5 over radical 10

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Please help to simplify

4i^7 - the square root of -5 * the square root of -5 + the square root of 7 * the square root of -7 - the square root of -16
Factor the following trinomial:

16x^2 + 40xy + 25y^2

I am still a little confused by this stuff. I hope that someone can help me understand????