book Maths Puzzle Numerical Ability

Simplify:

Square root of 2xy^5 times square root of 10x^8y^2

Assume that all variables represent positive real numbers.

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book Other Question

How do you find the discriminant for the polynomial 3x^2+13x-10 All that I have to do is factor this but I think that it is prime. Can someone please tell me if I am right? Thank you.
15x^2+16x+4