exam Maths Puzzle Numerical Ability

help with Rationalize the denominator

squareroot of 3 -1
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square root of 3 -2

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exam Other Question

4-4(-2+6+3*2)
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-3 to the second power + 7

I know the answer is supposed to be 2 but no matter what I try I can't come up with that. Please help. the ordered pair (1, -2) is a solution of the following system..true or false?
x+y=-3
x-y=1