Question

3х2-7х-40=0 решить уравнение

Answer 1

Ответ:

3х2-7х-40=0

6х-7х-40=0

-х-40=0

-х=40

х=-40

Объяснение:

если х в квадрате то

решаем через формулу дискриминанта

b^2-4ac

49-4х3х(-40)=529

х(1)=(7+23):6=5

х(2)=(7-23):6=-$\frac{8}{3}$

ответ х(1)=5

          х(2)=-$\frac{8}{3}$

Answer 2

4 6/7

Объяснение:

-7х=40-6

-7х=34

х=-34/7

х= -4 6/7

Answer 3

To solve the quadratic equation 3x^2 - 7x - 40 = 0, we can use the quadratic formula:

For an equation in the form of ax^2 + bx + c = 0, the quadratic formula is:

x = (-b ± √(b^2 - 4ac)) / 2a

In our case, a = 3, b = -7, and c = -40. Let's plug these values into the formula and solve for x:

x = (7 ± √((-7)^2 - 4 * 3 * -40)) / 2 * 3 x = (7 ± √(49 + 480)) / 6 x = (7 ± √529) / 6 x = (7 ± 23) / 6

Now, we have two possible solutions:

1. x = (7 + 23) / 6 x = 30 / 6 x = 5

2. x = (7 - 23) / 6 x = -16 / 6 x = -8/3

Therefore, the solutions to the equation are x = 5 and x = -8/3.