Question

(5x+30)(4,8-0,8x)=05x+30 или 4,8-0,8x =0

Answer 1

5х =-30
Х=-6

-0,8х=-4,8
Х= 6

Ответ: х1,2=+-6

Answer 2

Let's start by expanding the left-hand side of the equation using the distributive property:

(5x + 30)(4.8 - 0.8x) = 24x + 144 - 4x^2 - 24x

Simplifying this expression by combining like terms, we get:

-4x^2 + 24x + 144

Now we can set this expression equal to 0 and solve for x:

-4x^2 + 24x + 144 = 0

Dividing both sides by -4, we get:

x^2 - 6x - 36 = 0

This is a quadratic equation, which we can solve using the quadratic formula:

x = (-b ± sqrt(b^2 - 4ac)) / 2a

In this case, a = 1, b = -6, and c = -36, so we have:

x = (6 ± sqrt(6^2 - 4(1)(-36))) / 2(1)

x = (6 ± sqrt(252)) / 2

x = (6 ± 2sqrt(63)) / 2

x = 3 ± sqrt(63)

Therefore, the solution set for the equation is:

x = 3 + sqrt(63) or x = 3 - sqrt(63)

Note that neither of these solutions matches the initial expression of "0.5x + 30 or 4.8 - 0.8x = 0". Therefore, it seems there may have been a mistake in the original problem statement.