Question

3х2 -5х -8 = 0 уровнениэ х в квадрате

Answer 1

3x^2-5x-8=0

a=3 b= -5 c= -8

D=b^2-4ac

D=(-5)^2-4×3×(-8)=25+96=121=11^2

5+11. 5-11

X1 = - - - - X2=--------

6. 6

X1=2 2/3(2 целых 2/3)

X2= -1

(не забудь про сердечку и звёздочки))

Answer 2

Ответ:

3х^2-5х-8=0

а=3 b=-5 c=-8

D=(b)^2-4ас=(-5)^2-4*3*(-8)=25+96=121

D>0

x1=5+11/2*3=2 2/3

x2=5-11/2*3=-1

Ответ:х1=2 2/3 х2=-1

Answer 3

To solve the quadratic equation $3x^2 - 5x - 8 = 0$, we can use the quadratic formula. The quadratic formula states that for an equation in the form $ax^2 + bx + c = 0$, the solutions for $x$ can be found using:

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

Where $a$, $b$, and $c$ are the coefficients of the quadratic equation. In our case, $a = 3$, $b = -5$, and $c = -8$.

Let's solve for $x$:

$x = \frac{-(-5) \pm \sqrt{(-5)^2 - 4 \cdot 3 \cdot (-8)}}{2 \cdot 3}$

Simplifying the expression:

$x = \frac{5 \pm \sqrt{25 + 96}}{6}$

$x = \frac{5 \pm \sqrt{121}}{6}$

$x = \frac{5 \pm 11}{6}$

Now, we get two possible solutions for $x$:

1. $x = \frac{5 + 11}{6} = \frac{16}{6} = \frac{8}{3}$

2. $x = \frac{5 - 11}{6} = \frac{-6}{6} = -1$

So, the solutions to the equation $3x^2 - 5x - 8 = 0$ are $x = \frac{8}{3}$ and $x = -1$.