exam Maths Puzzle Numerical Ability

Divide: 5x^3-5x+1 by x-3

I tried factoring out the 5 and ended up with 5(x^2-x-3)+x as the answer
Am I anywhere close?????

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exam Other Question

how do i work out the number of sides in a shape when i am given the exterior angle of 15? The question is: Find the domain (the interval(s) on the real number line for which the radicand is nonnegative, greater than or equal to zero).
Squar root x-3

Thank you