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ICSE Class 9 Answered

If a= 1-√3, find the value of (𝑎−1/𝑎)^3.
Asked by v.venkateshalu | 01 Feb, 2021, 10:17: AM
answered-by-expert Expert Answer
Given: a= 1-√3
open parentheses straight a minus 1 over straight a close parentheses cubed equals open parentheses 1 minus square root of 3 minus fraction numerator 1 over denominator 1 minus square root of 3 end fraction close parentheses cubed equals open parentheses 1 minus square root of 3 minus fraction numerator 1 plus square root of 3 over denominator negative 2 end fraction close parentheses cubed equals open parentheses fraction numerator 2 minus 2 square root of 3 plus 1 plus square root of 3 over denominator 2 end fraction close parentheses cubed equals open parentheses fraction numerator 3 minus square root of 3 over denominator 2 end fraction close parentheses cubed equals fraction numerator 27 minus 3 square root of 3 minus 27 square root of 3 plus 27 over denominator 8 end fraction equals fraction numerator 54 minus 30 square root of 3 over denominator 8 end fraction
Answered by Renu Varma | 03 Feb, 2021, 04:45: PM

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