exam Maths Puzzle Numerical Ability

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

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exam Other Question

I have been struggling on this math problem for awhile now and I was wondering if someone could help me? I would deeply appreciate it!! Please and Thank you!!

u^2-4v^2+3u-6v
f(x)=2x+5 determine by inspection the slope and y-intercept of each line