book Maths Puzzle Numerical Ability

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

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book Other Question

Solve each compound inequality. State the solution set using interval notation and graph it

4. x <= 0 and x + 6 > 3 What if 0 and 3-2i are roots of a polynomial equation. What are the other roots of the equation?