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Dear R Helpers, I need to find the root of following equationy=x^2+3*x-1 by substitution a random number from less to more in the certain segment.I had tried using this codef <- function (x) x^2+x-12str(xmin <- uniroot(f, c(2, 4), tol = 0.0001)) but $ f.root : num -7.85e-07not 0, and so I'm not shure it's right code and satisfactory answer. Please guide. sveta -- View this message in context: http://r.789695.n4.nabble.com/Finding-root-of-quadratic-equation-tp4646124.html Sent from the R help mailing list archive at Nabble.com. [[alternative HTML version delet...