Question

-X*2+8*X-15=0ytggffrffyghhh

Answer 1

x=3,x=5

Объяснение:

-x^2+8x-15=0. необходимо умножить на -1 .

x^2-8x+15=0. далее по теореме Виета

x1×x2=15

x1+x2=8

находи , что x1=3, а x2=5

Answer 2

It seems like you've provided an equation:

-X*2 + 8*X - 15 = 0

To solve for the value of X, we can use the quadratic formula:

X = $-\frac{B}{2A} \pm \frac{\sqrt{B^2 - 4AC}}{2A}$

In your equation, A = -1, B = 8, and C = -15. Plugging these values into the quadratic formula:

X = $-\frac{8}{2(-1)} \pm \frac{\sqrt{8^2 - 4(-1)(-15)}}{2(-1)}$

Simplifying further:

X = 4 \pm \frac{\sqrt{64 + 60}}{-2}

X = 4 \pm \frac{\sqrt{124}}{-2}

X = 4 \pm \frac{2\sqrt{31}}{-2}

Now, splitting into two possible solutions:

1. X = 4 + $\sqrt{31}$
2. X = 4 - $\sqrt{31}$

So, the solutions for the equation are approximately:

1. X ≈ 8.196
2. X ≈ -0.196