simplify by rationalising the denominator of 7+2 root 5 /7-2 root 5
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7+2 is the rationalizing denominator of the above
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= [(7+2√5) / (7-2√5)] × {(7+2√5)/(7+2√5)]
= (7+2√5)^2 / 49-20
= 49 + 20 + 28√5 / 29
= 69 + 28√5 / 29
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