exam Maths Puzzle Numerical Ability

I cannot figure this out - can someone please help.

4sqrt72 - 2sqrt48

Thank you

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exam Other Question

I would like to know if i did this problem correct. this problem is from a work sheet.
y=2x and y=2-1
_2=2(-1) and -2=-1-1 solve the following system of equations using matrices:

x+y+2=-9
x-y+5z=-19
5x+y+z=29