Question

resolva as equações do 2 grau em R a) x2-5+6=0

Answer 1

x^2 -5x + 6 = 0 ==> (x - 3)(x - 2) = 0 ==> x - 3 = 0 ==> x' = 3 ===> x - 2 = 0 ==> x'' = 2 ==> S = {2,3}

Answer 2

x² - 5x + 6 = 0
a = 1; b = - 5; c = 6

Δ = b² - 4ac
Δ = (-5)² - 4.1.6
Δ = 25 - 24
Δ = 1

x = - b +/- √Δ       = - (-5) +/- √1
      ----------------      -----------------
             2a                      2.1

x = 5 + 1
      --------- = 6/2 = 3
         2

x = 5 - 1
      --------  = 4/2 = 2
         2

R.: x = 3 e x = 2