Question

343.° Розв'яжіть рівняння:
4) 12 - (6 - 9x - x ^ 2) = x ^ 2 + 5x - 14
3) 6 + x ^ 3 - (2x - 9 + x ^ 3) = 5
С объяснением пж!

Answer 1

Объяснение:

4) 12 - (6 - 9x - x^2) = x^2 + 5x - 14

12 - 6 + 9x + x^2 = x^2 + 5x - 14

6 + 9x + x^2 = x^2 + 5x - 14

9x + 5x - x^2 - x^2 = -14 - 6

14x - 2x^2 = -20

-14x + 2x^2 = 20

2x^2 - 14x - 20 = 0

x^2 - 7x - 10 = 0

3) 6 + x^3 - (2x - 9 + x^3) = 5

6 + x^3 - 2x + 9 - x^3 = 5

15 - 2x = 5

-2x = 5 - 15

-2x = -10

x = -10 / (-2)

x = 5