text: (log x)(log x^2) + log x^9 - 5\n= 2 (log x)^2 + 9 log x - 5\n\nlet t=log x\nthen, 2 t^2 + 9t -5 =0 is just a simple quadratic function\nfactor: (2t-1)(t+5) = 0\nhence, t=1/2 or t=-5\n\nsince t=log x, and a log function is never negative,\nwe get t=log x = 1/2\nso, x = exp(1/2) = 1.6487