2013 YJC P1 Q8
(i)
Expand $\frac{\sqrt{4+x}}{1-x}$ in ascending powers of $x$, up to and including the term in ${{x}^{2}}$. State the set of values of x for which the expansion is valid.
[5]
(ii)
By substituting $x=-\frac{1}{10}$, obtain an estimate for $\sqrt{390}$, leaving your answer as a fraction.
[2]
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