Question

2х^2+7х-9=0 Пожалуйста

Answer 1

a=2 b=7 c=-9

D= 7^2 - 4*2*(-9) = 121

x1 = 18/4= 4,5

x2= -4/4=-1

Ответ: 4,5; -1

Answer 2

$2 {x}^{2} + 7x - 9 = 0 \\ d = {b}^{2} - 4ac = {7}^{2} - 4 \times 2 \times ( - 9) = 49 +72 =121 = {11}^{2} \\ x1 = \frac{ - 7 + 11}{2 \times 2} = \frac{4}{4} = 1 \\ x2 = \frac{ - 7 - 7}{2 \times 2} = \frac{ - 14}{4} = \frac{ - 7}{2} = - 3.5$