exam Maths Puzzle Numerical Ability

Simplify. (Multiply)

( -5 {{{ (sqrt x + sqrt y) }}} )({{{ sqrt (x-4) sqrt (y)}}} )

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exam Other Question

Find all the roots of the polynomial x^3 -x^2 + 16x - 16. I am in need of some help with these question

Simplify by combining like terms:
x Sqaure root 18- 3 square root 8x^2

and
simplify each radical expression

(square root 3+5)(square root 3-3)

Thank you for your help