exam Maths Puzzle Numerical Ability

how can I simplify this radical expression
(sqrt3+5)(sqrt3-3)

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exam Other Question

Please, please help? I need to solve:

by addition: 5x - 3y = 13 4x - 3y = 11

by graphing:x - y = 5
x + y = -1

dear tutor: please help! i have a question where x = 2,4,6,8,10 and y = 3,8,15,24,35. what would the equation be that would match this graph? thanks, joe