exam Maths Puzzle Numerical Ability

x^2-1/x divide x+1/x-1

= x^2/x+1 ?

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exam Other Question

is (sqrt x)^2= x an identitiy (true for all nonnegative values of x?
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for the function, y=1/x-2, give the y values for x= -1,0,1,2,3,4

for the equation x-2sqrt
2-|7x-4|=5