Question

X²-8x-9=0ggggggggggg​

Answer 1

Ответ:

x1= - 1

x2= 9

Объяснение:

x^2 - 8x - 9 = 0

x^2 + x - 9x - 9 = 0

x(x+1) - 9(x+1) = 0

(x+1) × (x-9) = 0

x+1=0

x-9=0

Answer 2

It looks like you've provided a quadratic equation: $x^2 - 8x - 9 = 0$. If you're looking to solve for the values of $x$, I can help you with that.

To solve this quadratic equation, you can use the quadratic formula:

$x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$

In your equation $x^2 - 8x - 9 = 0$, you have $a = 1$, $b = -8$, and $c = -9$. Plugging these values into the quadratic formula:

$x = \frac{8 \pm \sqrt{(-8)^2 - 4 \cdot 1 \cdot (-9)}}{2 \cdot 1}$

Simplifying under the square root:

$x = \frac{8 \pm \sqrt{64 + 36}}{2}$ $x = \frac{8 \pm \sqrt{100}}{2}$ $x = \frac{8 \pm 10}{2}$

Now, you have two possible solutions:

1. $x = \frac{8 + 10}{2} = 9$
2. $x = \frac{8 - 10}{2} = -1$

So, the solutions for the equation $x^2 - 8x - 9 = 0$ are $x = 9$ and $x = -1$.