Question

X2-2x+5=0
4x2+20x+25=0

Answer 1

Ответ:

$1)x2 - 2x + 5 = 0$

$d = 4 - 20 = - 16$

Не имеет корней.

2)

$4x {}^{2} +20x + 25 = 0$

$d = 400 - 400 = 0$

$x = \frac{ -20}{8} = - 2 \frac{4}{8} = - 2.5$