Question

x² - 7x +10 = 0 EU QUERIA SABER A CONTA

Answer 1

Δ = 49 - 40 
Δ = 9 

x = 7 +-√9/2
x = 7 +-3/2

x' = 7+3/2
x' = 10/2 = 5

x''= 7-3/2
x'' = 4/2 = 2                  ok

Answer 2

x² - 7x + 10 = 0
a = 1; b = - 7; c = 10
Δ = b² - 4ac
Δ = (-7)² - 4.1.10
Δ = 49 - 40
Δ = 9

x = - b +/- √Δ      = - (-7) +/- √9
      ----------------     ----------------
             2a                  2.1

x = 7 + 3
     ---------  = 10/2 = 5
          2

x = 7 - 3   = 4/2 = 2
      ------
         2

R.: x = 2 e x = 5