rationalise the denominator:7-3√2by7+3√2
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(7-3√2)/(7+3√2)
=(7-3√2)(7-3√2)/(7+3√2)(7-3√2)
=(49+18-42√2)/(49-18)
=(67-42√2)/31
=(7-3√2)(7-3√2)/(7+3√2)(7-3√2)
=(49+18-42√2)/(49-18)
=(67-42√2)/31
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