exam Maths Puzzle Numerical Ability

can you please help me with this problem. i have tried to do parts of it. and i started of by multiplying by the conjugate.
This is the problem

spare root of 5 divided by square root of six plus 8

THANK U

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exam Other Question

determine the equation of each line. Write the answer in standard form using only integers as the coefficients.

The line through (-2,0) with slope -3/4. (the negative sign next to the 3/4 is in the middle of the 3 and 4 next to the divide line)
Divide 6a^3-5a^2-3a+2 by 2a-1