Question

2х^2-7х-4=0, помогите с решение ​

Answer 1

$2 {x}^{2} - 7x - 4 = 0$

$d = {7}^{2} - 4 \times 2 \times ( - 4)$

$d = 49 + 32 = \sqrt{81}$

х1;2=

$x1 = \frac{7 + 9}{2 \times 2} = 16 \div 4 = 4$

$x2 = \frac{7 - 9}{2 \times 2} = - 2 \div 4 = - 0.5$

Answer 2

На фотографии решение