book Maths Puzzle Numerical Ability

My question says to simplify the radicals.

(square root of 6- square root of 5)( square root of 6+ square root of 5)

Could you help me? thanks!

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book Other Question

Factor each expression completely:
-21 a x3y3 - 28x3y4 + 7x2y3z

xy + 3y -6x -18

6a2 + 4bx - 15a-10b

16a2 + 8a - 15
complete the square, and find the roots of the quadratic equation.

x^2 + 16x = 0