Question

quak a resoluçao par a equaçao x2+3x=0

Answer 1

x² + 3x = 0
x(x + 3) = 0
x = 0

x + 3 = 0
x = - 3

R.: x = 0 e x = - 3

Answer 2

x²+3x = 0 ---> a = 1, b = 3, c = 0

Δ= 3²-4.1.0
Δ= 9

x = -3 +- √9    -3 +- 3 
      ---------- =   --------
          2.1              2

x' = -3 + 3      0
       -------- = 
          2

x'' = -3 -3     -3
        ------ = 
          2

S= {-3,0}