exam Maths Puzzle Numerical Ability

Okay
I have a chart like this:

n 1 2 3 4 5
f(n) -3 0 3 6 9

I need to determine the degree and find the equation of the polynomial
HELP PLEASE
thanks
llo

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exam Other Question

I need help solving this logarithmic equation

log(x-14)-log5=log(x-12)-logx Solve the equation x2 + 3x - 9 = 0.
multiply and simplify (3x+5) (x-3)
3x(2x2 + 5x - 4) =
Factor the expression 6x2 - 27x - 15 completely.