# Number Systems

Practice Questions in Irrational numbers, real numbers, exponents

9. #### Rationalise & find value of cubic expression

If x = $\frac{1}{8-\sqrt{60}}\\$, what is the value of $x^{3}-5x^{2}+8x-4?\\$

10. #### Rationalise the denominator

$\frac{1}{9 + {\sqrt{5} + \sqrt{6}}}\\$