Question

(7-5x)(7+5x)+x(25x-9)=4

Answer 1

Ответ: 5.

Решение:

(7 - 5x)(7 + 5x) + x*(25x - 9) = 4

49 - 25x² + 25x² - 9x = 4

49 - 9x = 4

9x = 49 - 4

9x = 45

x = 5

Answer 2

To solve the equation (7-5x)(7+5x)+x(25x-9)=4, we'll follow these steps:

1. Expand the expressions within the parentheses: (7-5x)(7+5x) + x(25x-9) = 4 (49 - 35x + 35x - 25x^2) + (25x^2 - 9x) = 4

2. Simplify and combine like terms: 49 - 25x^2 + 25x^2 - 35x + 35x - 9x = 4 49 - 9x = 4

3. Move constants to one side and variables to the other side: -9x = 4 - 49 -9x = -45

4. Divide both sides of the equation by -9 to solve for x: x = (-45) / (-9) x = 5

Therefore, the solution to the equation is x = 5.