Question

14-9x+x² решите пж....................

Answer 1

${x}^{2} - 9x + 14 = 0$
а=1, b=-9, c=14

${b}^{2} - 4ac = ( - 9)^{2} - 4 \times 1 \times 14 = 81 - 56 =25$
$x1 = \frac{ - b + \sqrt{d} }{2a} = \frac{ 9 + 5}{2} = \frac{14}{2} = 7$
$x2 = \frac{9 - 5}{2} = \frac{4}{2} = 2$
Ответ: Х1=7; Х2=2