Question

(-1-х)(-7х-14)=0 х+9х-5х=-2,5 уравнение

Answer 1

7x + 14 + 7x^2 + 14x = O

7x^2 + 21x + 14 = O

7x^2 + 21x = -14

x( 7x + 21 ) = -14

x1 = -14 ; 7x + 21 = -14

7x = -14 - 21

7x = - 35

Answer 2

Let's solve the equation step by step.

1. Begin with the expression: $(-1-x)(-7x-14) = 0$

To find the values of $x$ that satisfy this equation, we need to set each factor equal to zero and solve for $x$.

a) Set $(-1-x) = 0$

Adding $1$ to both sides:

$-x = 1$

Now, multiply both sides by $-1$ to solve for $x$:

$x = -1$

b) Set $(-7x-14) = 0$

Adding $14$ to both sides:

$-7x = 14$

Now, divide both sides by $-7$ to solve for $x$:

$x = -2$

So, the two solutions for $x$ are $x = -1$ and $x = -2$.

2. Now let's solve the equation $x + 9x - 5x = -2.5$.

Combine the $x$ terms on the left side:

$x + 9x - 5x = 5x = -2.5$

Now, divide both sides by $5$ to solve for $x$:

$x = -2.5/5$

$x = -0.5$

So, the solution for the second equation is $x = -0.5$.

To summarize:

• The solutions for the first equation $(-1-x)(-7x-14) = 0$ are $x = -1$ and $x = -2$.
• The solution for the second equation $x + 9x - 5x = -2.5$ is $x = -0.5$.