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CBSE Class 9 Answered

Please answer both 1st part and 2nd part 
question image
Asked by Girishdhawan | 23 Jun, 2018, 08:47: AM
answered-by-expert Expert Answer
begin mathsize 16px style left parenthesis straight i right parenthesis space 4 straight x squared space minus space 4 square root of 7 straight x space plus space 7 space equals space 0 rightwards double arrow 4 straight x squared space space minus space 2 square root of 7 straight x minus space 2 square root of 7 straight x space plus space 7 space equals space 0 rightwards double arrow 2 straight x space left parenthesis space 2 straight x space minus space square root of 7 right parenthesis space minus space square root of 7 left parenthesis space 2 straight x space minus space square root of 7 right parenthesis equals space 0 rightwards double arrow left parenthesis space 2 straight x space minus space square root of 7 right parenthesis left parenthesis space 2 straight x space minus space square root of 7 right parenthesis equals 0 rightwards double arrow space left parenthesis space 2 straight x space minus space square root of 7 right parenthesis space equals space 0 space or space left parenthesis space 2 straight x space minus space square root of 7 right parenthesis space equals space 0 rightwards double arrow straight x space equals space fraction numerator space square root of 7 over denominator 2 end fraction space or space straight x space equals space fraction numerator space square root of 7 over denominator 2 end fraction left parenthesis ii right parenthesis space straight a cubed space minus space 5 square root of 5 straight b cubed space equals left parenthesis space straight a right parenthesis cubed space minus space left parenthesis square root of 5 straight b right parenthesis cubed space................ left parenthesis space since comma 5 square root of 5 space equals space 5 to the power of 1 space cross times space 5 to the power of 1 half end exponent space equals space 5 to the power of 1 space plus 1 half end exponent equals space 5 to the power of 3 over 2 end exponent equals left parenthesis square root of 5 right parenthesis cubed right parenthesis equals space left parenthesis space straight a space minus space square root of 5 straight b right parenthesis left parenthesis straight a squared space plus space square root of 5 ab space plus 5 straight b squared right parenthesis end style
Answered by Yasmeen Khan | 25 Jun, 2018, 02:32: PM

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