exam Maths Puzzle Numerical Ability

solve
9x^2=14

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exam Other Question

im confused on how rto wokr this sequence out
0,14, 52, 126, 248
i have tried n cubed but cannot find the answer? Rewrite in standard form:

(0,5),m=-3/5

Give your result in slope intercept form where possible

I do not have a clue as to where to start with this problem, Please help!!