Question

2 Rezolvați ecuațiile: a) 3x² = 12; c) -x² + 5 = 0; b) 2x² - 6 = 0; d) x² + 4 = 0.​

Answer 1

$\it 3x^2=12\bigg|_{:3} \Rightarrow x^2=4 \Rightarrow x=\pm2\\ \\ \\ x^2+4=0 \Rightarrow x^2=-4 \Rightarrow x=\pm2i$