book Maths Puzzle Numerical Ability

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

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book Other Question

Write an equation in slope-intecept form of the line satisfying the given conditions.
perpendicular to the graph of 4x-y=12, please show how you got this answer also. Thank You! Write the equation of each line. Give the answer in slope-intercept form.

The line through (-1, -@0 with slope 3/7