[tex]x {}^{2} - 2x = 0 \\ x \times (x - 2) = 0 \\ x = 0 \\ x - 2 = 0 \\ x = 0 \\ x = 2 \\ x1 = 0. \: x2 = 2[/tex]
[tex]3x {}^{2} + 9x = 0 \\ 3x \times ( x + 3) = 0 \\ x \times (x + 3) = 0 \\ x = 0 \\ x + 3 = 0 \\ x = 0 \\ x = - 3 \\ x1 = - 3. \: x2 = 0[/tex]
Explicație pas cu pas:
[tex]a)x {}^{2} + 3x = 0 \\ x \times (x + 3) = 0 \\ x = 0 \\ x + 3 = 0 \\ x = 0 \\ x = - 3 \\ x1 = - 3. \: x2 = 0[/tex]
