exam Maths Puzzle Numerical Ability

can someone please help me solve and understand this division and simplify it?

-9-sqrt{{{108}}}/3

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exam Other Question

Find the number of degrees in each angle of a regular octagon. Given -x^2-6x-3, is the vertex a maximum or minimum for the function? What is the value fo that maximum or minimum?

There is nothing in my book about maximums and minimums, please help!