Question

решите уравнение
2x²-13x+21=0

Answer 1

$2 x^{2} -13x+21=0$
$D=13^2-4*21*2=1$
$x_{1} = frac{13-1}{2*2} =3$
$x_{2} = frac{13+1}{2*2} = frac{14}{4} = frac{7}{2}=3,5$

Ответ: 2 * (x - 3) * (x - 3,5) = (x - 3) * (2x - 7) = 0