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Rationalise the denominator of (1)/(7+4...

Rationalise the denominator of `(1)/(7+4sqrt(3))`.

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`(1)/(7+4sqrt(3))=(1)/(7+4sqrt(3))xx(7+4sqrt(3))/(7+4sqrt(3))" "(because"rationalisation factor is"7-4sqrt(3))`
`=(7-4sqrt(3))/((7)^(2)-(4sqrt(3))^(2))=(7-4sqrt3)/(49-48)=7-4sqrt(3)`
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