Question

(5-2х)(4х^2+10х+25)=2,5 х-8х^3​

Answer 1

Ответ:

х = 50

Объяснение:

(5 - 2 х) (4 х 2 + 10 х + 25) = 2,5 х - 8 х 3,

53 - (2 х) 3 = 2,5 х - 8 х 3,

125 - 8 х3 = 2,5 х - 8 х 3,

-2,5 х = - 125,

х = 50

Answer 2

To check whether the equation (5-2x)(4x^2+10x+25) = 2.5x - 8x^3 is true, we need to perform the multiplication on the left side and simplify to see if it matches the right side.

First, let's expand the left side of the equation:

(5 - 2x)(4x^2 + 10x + 25) = 2.5x - 8x^3

Using the distributive property of multiplication, we multiply each term of the first expression (5 - 2x) by each term of the second expression (4x^2 + 10x + 25):

(5)(4x^2) + (5)(10x) + (5)(25) + (-2x)(4x^2) + (-2x)(10x) + (-2x)(25) = 2.5x - 8x^3

Now, simplify each term:

20x^2 + 50x + 125 - 8x^3 - 20x^2 - 50x = 2.5x - 8x^3

Notice that the terms with x^2 and x cancel each other out:

20x^2 - 20x^2 = 0 50x - 50x = 0

So, the equation simplifies to:

125 = 2.5x - 8x^3

However, this simplified equation is not equivalent to the original right-hand side 2.5x - 8x^3. Therefore, the initial equation (5-2x)(4x^2+10x+25) = 2.5x - 8x^3 is not true.

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