book Maths Puzzle Numerical Ability

Simplify.... (x^3-8) / (x-2)

Comment---> no idea where to start!

Thank you

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book Other Question

The lines satsifying the equations x + dy=3 and 3y +ax=2 are perpendicular to each other find a what is the exact value of sin 22.5 degrees using the sum, difference, half, or double angle formulas and the exact value chart in the solution.