exam Maths Puzzle Numerical Ability

I dont understand how to answer this problem because:
1)i dont get how you find the domain
2)i dont understand how i graph the equation

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exam Other Question
Simplify: (625)^1/2 find all the zeros for f(x)=x to the fourth power - 6 times x to the third power + 9 times x to the second power + 6 times x - 10 if one zero is 3-i