exam Maths Puzzle Numerical Ability

Rationalize the denominator. Which means to get rid of the radical in the denominator.
8/6- squareroot of 15

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exam Other Question

x^3-4x^2-3x-10 x=-5

I am not sure how to solve this can you please help
Reduce the fractions to lowest terms.
x^3+x^2+x+1/x^2-1