exam Maths Puzzle Numerical Ability

Hi, Can you help me with this math problem?

If f is one-to-one find and equation for its universe.
f(x)=x^3-5

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exam Other Question

11. Simplify: -(-50).
Thanks so much for your time!!!!!!!!
Give answer in a + bi form.

4 - 5i / 2 + 3i