Question

Como resolver x²-x-30=0

Answer 1

x²-x-30=0 a = 1; b = -1; c = - 30 /\= b^2 - 4ac /\= (-1)^2 - 4.1.(-30) /\= 1+120 /\= 121 x = (- b +/- \//\)/2a X = [-(-1)+/- \/121]/2.1 X = (1 +/- 11)/2 X' = (1+11)/2= 12/2= 6 x" = (1-11)/2= -10/2= - 5 Resp.: S = {6, -5}