Question

determine raizes reais ou imaginaria
 x²-2x+5=0 ??

Answer 1

$x^2-2x+5=0\\\Delta=(-2)^2-4*1*5\\\Delta=4-20\\\Delta=-16$

$x= \frac{-b\pm \sqrt{\Delta} }{2a}$

$x= \frac{2\pm \sqrt{-16} }{2*1} \\ \\x= \frac{2\pm4i}{2} \\ \\x= \frac{\not2(1\pm2i)}{\not2} \\ \\\boxed{x=1\pm2i}$

Answer 2

Resposta:

Explicação passo-a-passo: