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ICSE Class 9 Answered

If x = 3 + 2×under root 2, find the value of x - 1÷x
Asked by bhengrajp | 17 May, 2019, 02:00: PM
answered-by-expert Expert Answer
begin mathsize 16px style straight x space equals space 3 space plus space 2 square root of 2 space space To space find colon space straight x space minus space 1 over straight x space equals space ? 1 over straight x space equals space fraction numerator 1 over denominator 3 space plus space 2 square root of 2 end fraction rightwards double arrow space 1 over straight x space equals space fraction numerator 1 over denominator 3 space plus space 2 square root of 2 end fraction space cross times space fraction numerator 3 space minus space 2 square root of 2 over denominator 3 space minus space 2 square root of 2 end fraction space equals space fraction numerator 3 space minus space 2 square root of 2 over denominator 9 space space minus space 8 end fraction space equals space 3 space minus space 2 square root of 2 straight x space minus space 1 over straight x space equals space 3 space plus space 2 square root of 2 space minus space open parentheses space 3 space minus space 2 square root of 2 close parentheses space equals space 4 square root of 2 end style
Answered by Yasmeen Khan | 17 May, 2019, 02:38: PM

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