exam Maths Puzzle Numerical Ability

For f(x) = 1/x^2-2x-8, find the interval(s) where f(x)<0.

possible answers:
(-4,2)
(-2,4)
(2,4)
(2,8)

Please show me an example how to perform this operation. Thanks

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exam Other Question
Graph the set {x|<_ x <_ 5 on a number line (-7 through 7). Also write the set using interval notation



NOTE: <_ means less than or equal to. The total profit for a company in February is 20% higher than it was in january. The total profit for the two months was 157498. Find the profit for each month