Question

funcao do 2 grau , formas de resolucao de funcoes incompletas e completas

Answer 1

a)

x² - 9 = 0
x² = 9
x = √9
x = + 3 e x = - 3

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
b)

x² - 5x = 0
x.(x - 5) = 0
x = 0

x - 5 = 0
x = 5

R.: x = 0 e x = 5
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
c) 
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