Question

3) -2x2 + x + 15 = 0;​

Answer 1

Ответ:

x=-11

Пошаговое объяснение:

Answer 2

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

x = (-b ± √(b² - 4ac)) / (2a)

In this equation, a = -2, b = 1, and c = 15. Plug these values into the formula and solve for x:

x = (-1 ± √(1² - 4(-2)(15))) / (2(-2))

First, calculate what's inside the square root:

1² - 4(-2)(15) = 1 + 120 = 121

Now, plug it back into the formula:

x = (-1 ± √121) / (-4)

x = (-1 ± 11) / (-4)

Now, calculate both solutions:

1. x = (-1 + 11) / (-4) = 10 / (-4) = -5/2
2. x = (-1 - 11) / (-4) = -12 / (-4) = 3

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