Rationalise the denominator of 5/root7-2
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1 \div \sqrt{7 - 2 } \\ rationalising \: the \: denominator \\
1/√7-2 x √7+2 /√7+2
= √7+2 / (√7)²-(2)²
= √7+2 / 7-4
= √7+2/ 3 is the answer.
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