exam Maths Puzzle Numerical Ability

Simplify:

square root of 15x^6 * the square root of 16x^5

I got the answer 4x^5 square root of 15x. Is this correct? Thanks so much!!

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exam Other Question

The function y=2x^2+x+3 has a minimum value....is that correct?
yes
Tn=3n-4
write the first five terms of the sequence