book Maths Puzzle Numerical Ability

what does
the state of the domain and range mean?

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book Other Question

Hi
Please can you create partial fractions from the following?

{{{(x^2 + x - 1) / (x^2 + 1)(x -1)}}}
Find all real and imaginary solutions to each equation.
b^4 + 13b^2 + 36 = 0