Question

-x²-2x+15=0 кв уравнение

Answer 1

-x
$- x {}^{2} - 2 + 15 = 0 \\ 1)434361131311166 \\ 633444444 \\ 34 - \times 1144. \times \div 44 \\ 1. - - 355 {x \frac{?}{?} }^{?}$

Answer 2

Ответ:

ветки верх решаем по дискриминанту можно и виета там два способа короче дискриминант равен 4плюс 60 равно 64 корень из дисркиминанта 8 дальше корни икс один равно 2плюс8разделеное на минус два равно минус 5

второй корень равен 2минус 8 разделеное на минус два равно 3

все

Пошаговое объяснение:

Answer 3

To solve the quadratic equation -x² - 2x + 15 = 0, we can use the quadratic formula:

The quadratic formula states that for an equation in the form ax² + bx + c = 0, the solutions for x are given by:

x = (-b ± √(b² - 4ac)) / 2a

In our equation, a = -1, b = -2, and c = 15. Substituting these values into the quadratic formula:

x = (2 ± √((-2)² - 4*(-1)15)) / 2(-1)

Now, let's calculate the discriminant (the value inside the square root):

Discriminant = b² - 4ac Discriminant = (-2)² - 4*(-1)*15 Discriminant = 4 + 60 Discriminant = 64

Since the discriminant (64) is positive, we have two distinct real solutions for x.

Now, plug the discriminant into the quadratic formula:

x = (2 ± √64) / (-2)

Now, calculate the two solutions for x:

1. x = (2 + √64) / (-2) x = (2 + 8) / (-2) x = 10 / (-2) x = -5

2. x = (2 - √64) / (-2) x = (2 - 8) / (-2) x = -6 / (-2) x = 3

So, the solutions to the quadratic equation -x² - 2x + 15 = 0 are x = -5 and x = 3.