book Maths Puzzle Numerical Ability

I am trying to get into level 2 algebra at my comm. college. Its been almost 8 years since i've been in school, so im a little rusty!!! Here are a few examples if you could please

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directions: find all the roots of each equation.

2x^3+3x^2-6x-9=0
What is the formula to find the distance between 2 points on a graph. For example the points are (-2,5) & (-3,-1)