exam Maths Puzzle Numerical Ability

How do I find the formula for the number of diagonals in a polygon with "n" sides?

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exam Other Question

3y-21=12x Find the x-intercepts and y-intercepts for f(x).

f(x) = x^2 - 8x + 9


The x-intercepts are: 1.354 & 6.646
the y-intercepts are: 9

Thank you!