Question

calcule as raízes ( zeros ) da função f(x)= x²-6x+8​

Answer 1

x² -6x +8 =0 ==> b/c= -6/8= -2-4/-2•-4

(x -2). (x -4)=0

x'=2. x"=4 <====©

Answer 2

x^2 - 6x + 8 = 0

x^2 - 6x = -8

x^2 - 6x + 9 = -8 + 9

(x - 3)^2 = 1

x - 3 = 1

x = 4

x -- 3 = -1

x = 2

S = (2,4)