exam Maths Puzzle Numerical Ability

Factor each completely

36x(squared)+30x-24

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exam Other Question

A sequence is generated by the formula tn=5n^3+2n^2-3.At which level would you expect to find a common difference? I think the answer is the third level because the first exponent Complete:

If (x,12,13) is a Pythagorean triple, then x = _______________