exam Maths Puzzle Numerical Ability

What is "restriction" in regards to an equation?

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exam Other Question

FOR f(x)= 1 OVER x2-2x-8, FIND THE INTERVAL(S) WHERE f(x)<0. Solve for x: 3^x+2 plus 3^x = 270
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How to answer this quesiton with logs appearing in at least one of the steps?

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