exam Maths Puzzle Numerical Ability

Simplify the radical expression.
(sqrt3 +5)(sqrt3 -2)

Can someone help? Thanks

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exam Other Question

Find (fg)(x). What is the domain of f/g

f(x)=2x-5, g(x)=2-x On a trip, Debbie spent as much time on the train as she did on the bus. the train averaged 50 miles per hour and the bus averaged 35 miles per hour. If she went 105 miles more on the train, how far did she go altogether?