book Maths Puzzle Numerical Ability

What if 0 and 3-2i are roots of a polynomial equation. What are the other roots of the equation?

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book Other Question

Explain the process and show EACH step in the process of simplifying the following problems:
a.(sqrt2 + 5)(sqrt2 - 3)
b. sqrt5/sqrt8
c. (6 - sqrt20)/2 Factor
12x4</sup>y3</sup> + 16x3</sup>y3</sup> - 20x3</sup>y4</sup>