Question

R) x2 + 20x + 91 = 0.​

Answer 1

Ответ:

x₁ = -7

x₂ = -13

Объяснение:

х² + 20х + 91 = 0

D = b² - 4ac

D = 400 - 364 = 36

$x_{1,2}=\frac{-b+-\sqrt{D}}{2a}$

x₁ = (-20 + 6)/2 = -14/2 = -7

x₂ = (-20 - 6)/2 = -26/2 = -13

Answer 2

х^2 + 20х + 91 = 0

х1 = -13; х2 = -7 (по т. Виета)

Ответ: -13: -7

Answer 3

To solve the quadratic equation x^2 + 20x + 91 = 0, you can use the quadratic formula. The quadratic formula states that for an equation in the form ax^2 + bx + c = 0, the solutions for x are given by:

x = (-b ± √(b^2 - 4ac)) / (2a)

In this case, a = 1, b = 20, and c = 91. Plugging these values into the quadratic formula, we get:

x = (-20 ± √(20^2 - 4 * 1 * 91)) / (2 * 1)

Simplifying further:

x = (-20 ± √(400 - 364)) / 2 x = (-20 ± √36) / 2 x = (-20 ± 6) / 2

This gives us two possible solutions:

x1 = (-20 + 6) / 2 = -14 / 2 = -7 x2 = (-20 - 6) / 2 = -26 / 2 = -13

Therefore, the solutions to the equation x^2 + 20x + 91 = 0 are x = -7 and x = -13.