exam Maths Puzzle Numerical Ability

(2^2x5y-3z^4/4^0x-2y-8z^5)3

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exam Other Question

Can anyone solve this for me?

Find the value of the polynomial 2x^2-2x-4 when x=2
Subtract and write in simplest form:

12 10
---- - ----
z z

I believe the answer is:
2
---
z^2

Is this correct? Thank you