exam Maths Puzzle Numerical Ability

Please help me with the following. Thanks in advance.

sqrt of x-2=1

sqrt of x^3=27

3^sqrt x^2=9

Is (sqrt of x)^2 an identity (true for all nonnegative values of x)?

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exam Other Question

solve the formula for the letter D.

A=(BC)/D I am just trying to check over my answer to this question. I have that it is PRIME so therefore the polynomial is NOT factorable. The equation in question is 10-9y-2y^2