Question

raspunsul la intrebarea
${x}^{2} = 4$
si
${x }^{2} = - 4$

Answer 1

${x}^{2} = 4$

$x = \pm \sqrt{4}$

$x = \pm2$

${x}^{2} = - 4$

$x = \pm \sqrt{ - 4} = > nu \: exista$