Question

(-5х+2)*(-5х-2)+4х=-4

Answer 1

Ответ: x=-2/5  x=0

Объяснение: (-25x^2-4)+4x=-4

-25x^2+4x-4=-4

-25x^2+4x=0

x(25x^2+4)=0

x=0 или 25x^2+4=0

              25x^2=-4

              x^2=-4/25

              x=√-4/25

              x=-2/5

Answer 2

Let's solve the equation step by step:

Given equation: $(-5x + 2) \cdot (-5x - 2) + 4x = -4$

First, let's expand the product $(-5x + 2) \cdot (-5x - 2)$:

$(-5x + 2) \cdot (-5x - 2) = 25x^2 + 10x - 10x - 4 = 25x^2 - 4$

Now the equation becomes: $25x^2 - 4 + 4x = -4$

Combine like terms: $25x^2 + 4x - 4 = -4$

Subtract $4$ from both sides: $25x^2 + 4x = 0$

Now we have a quadratic equation. To solve for $x$, we can factor out $x$ from the left-hand side:

$x(25x + 4) = 0$

Now we have two possible solutions:

1. $x = 0$
2. $25x + 4 = 0$

For the second equation, solve for $x$:

$25x = -4$

Divide both sides by $25$:

$x = -\frac{4}{25}$

So, the solutions for the original equation are $x = 0$ and $x = -\frac{4}{25}$.