Question

$x {}^{2} - 21x + 110$
помагите

Answer 1

${x}^{2} - 21 + 110 = 0$
D=
$441 - 4 \times 1 \times 110 = 1$
$x1 = \frac{21 + \sqrt{1} }{2 \times 1} = \frac{21 + 1}{2} = \frac{22}{2} = 11$
$x2 = \frac{21 - \sqrt{1} }{2 \times 1} = \frac{21 - 1}{2} = \frac{20}{2} = 10$
ответ:
$x1 = 11 \\ x2 = 10$