Question

rationalised of denominator 1 / 5 - 2 root 3​

Answer 1

hey mate here is your answer

RF of 1/5-2root 3 is 1/5+2root 3

i.e

$\frac{1}{5 - 2 \sqrt{3} } \times \frac{5 + 2 \sqrt{3} }{5 + 2 \sqrt{3} } = \frac{5 + 2 \sqrt{3} }{25 - 12} = \frac{5 + 2 \sqrt{3} }{13}$

hope it may help you

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