exam Maths Puzzle Numerical Ability

i AM HAVING PROBLEMS WITH THIS
Simplify
sqaure root7(9sqaure root2-3sqaure root7)

Thank you

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exam Other Question

x+3y=9
-2x-6y=-18 You are 36 miles from a friend. You both start riding your bicycles toward each other at the same time. You travel 15 miles per hour and your friend travels 3 miles per hour slower. How far will you travel before you meet your friend?