exam Maths Puzzle Numerical Ability

Subtract and write in simplest form:

12 10
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z z

I believe the answer is:
2
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z^2

Is this correct? Thank you

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exam Other Question
(2^2x5y-3z^4/4^0x-2y-8z^5)3 Is the squ rt of x (squared) = x an identity (true for all values of x)?
Explain