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CBSE Class 10 Answered

find the value of a and b
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Asked by chitradevimamdapam | 15 May, 2020, 06:27: PM
answered-by-expert Expert Answer
(i) (root7 - 1)/(root7 + 1) - (root7 + 1)/(root7 - 1)
. fraction numerator square root of 7 minus 1 over denominator square root of 7 plus 1 end fraction minus fraction numerator square root of 7 plus 1 over denominator square root of 7 minus 1 end fraction
equals fraction numerator square root of 7 minus 1 over denominator square root of 7 plus 1 end fraction cross times fraction numerator square root of 7 minus 1 over denominator square root of 7 minus 1 end fraction minus fraction numerator square root of 7 plus 1 over denominator square root of 7 minus 1 end fraction cross times fraction numerator square root of 7 plus 1 over denominator square root of 7 plus 1 end fraction
equals fraction numerator 7 plus 1 minus 2 square root of 7 over denominator 7 minus 1 end fraction minus fraction numerator 7 plus 1 plus 2 square root of 7 over denominator 7 minus 1 end fraction
equals fraction numerator 8 minus 2 square root of 7 minus 8 minus 2 square root of 7 over denominator 6 end fraction
equals fraction numerator negative 2 square root of 7 over denominator 3 end fraction
Answered by Renu Varma | 16 May, 2020, 02:39: PM
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