exam Maths Puzzle Numerical Ability

PLEASE HELP ME WITH THIS PROBLEM;
For f(x)=1 over x62-2x-8 find the intervals where f(x)<0.

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exam Other Question

To meet the governments specifications, an alloy must be 65% aluminum. How many pounds each of a 70% aluminum alloy and a 54% aluminum alloy will be needed to produce 640 pounds of the 65% aluminum alloy?

Any help with this one is appreciated! How to solve an equation using synthetic division with the divisor of 3 terms?