Question

simplificar a raiz de x2 + 6x + 9

Answer 1

(x+3)(x+3)
x+3=0
x=-3
então x=-3 

Answer 2

Evidência:

x² + 6x + 9 = 0
x² + 3x + 3x + 9 = 0
x(x + 3) + 3(x + 3) = 0

x + 3 = 0
x = - 3

R.: x = - 3
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Báscara:

x² + 6x + 9 = 0
a = 1; b = 6; c = 9

Δ = b² - 4ac
Δ = 6² - 4.1.9
Δ = 36 - 36
Δ = 0

x = - b +/- √Δ
     --------------
          2a

x =  - 6 +/- 0
      --------------
            2.1

x = - 6/2
x = - 3