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CBSE Class 9 Answered

If 3x = 5y = (75)z , show that z = fraction numerator x y over denominator 2 x plus y end fraction .   
Asked by Trisha Gupta | 25 Feb, 2021, 10:56: AM
answered-by-expert Expert Answer
begin mathsize 16px style Let space 3 to the power of straight x equals 5 to the power of straight y equals 75 to the power of straight z space equals space straight k rightwards double arrow 3 equals straight k to the power of 1 over straight x space end exponent..... left parenthesis 1 right parenthesis comma space space space space space space 5 equals straight k to the power of 1 over straight y space end exponent space..... space left parenthesis 2 right parenthesis space and space space space space space 75 equals straight k to the power of 1 over straight z space end exponent rightwards double arrow 5 squared cross times 3 space equals space straight k to the power of 1 over straight z space end exponent rightwards double arrow open parentheses straight k to the power of 1 over straight y space end exponent close parentheses squared cross times straight k to the power of 1 over straight x space end exponent equals straight k to the power of 1 over straight z space end exponent rightwards double arrow straight k to the power of 2 over straight y plus 1 over straight x space space end exponent equals straight k to the power of 1 over straight z space end exponent space...... open parentheses straight a to the power of straight m close parentheses to the power of straight n equals space straight a to the power of mn space and space straight a to the power of straight m cross times straight a to the power of straight n equals straight a to the power of straight m plus straight n end exponent Since space base space are space same space so space powers space will space also space be space same. rightwards double arrow 2 over straight y plus 1 over straight x space equals 1 over straight z rightwards double arrow fraction numerator 2 straight x plus straight y over denominator xy end fraction space equals 1 over straight z rightwards double arrow straight z equals fraction numerator xy over denominator 2 straight x plus straight y end fraction end style
Answered by Yasmeen Khan | 25 Feb, 2021, 03:14: PM

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