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(121)^x=(0.125)^y=(484)^z,then find the value of z in terms of x and y. a)2xy/(3y-2x) b)3xy/(3y-2x) c)xy/(3y-2x) d)3xy/(2x-3y)

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Above eq can written as: 11^2x = (5/10)^3y = 22^2z or 11^2x = (2)^(-3y) = 2^2z . 11^2z multiply first two and equate with square of 3rd as all are equal 11^2x . 2^(-3y) = (2^2z . 11^2z ) ^2 now equate LHS & RHS powers which having same base: for power of 11 => 2x = 4z => z= x/2 -------------(a) for power of 2 => -3y = 4z => z= -3y/4 --------------(b) above two x/2 = -3y/4 => 2x = -3y -----------------------------------(c) now check option (hit and trial) try option 2: z = 3xy/(3y-2x) put value of 2x in denominator from eq c ===> z = 3xy / (3y +3y) ==> z= 3xy/6y => z=x/2 which is same as eq a HENCE option B: z = 3xy / (3y-2x)

A). 2xy/(3y-2x)