Question

Пожалуйста, помогите!)

Answer 1

1) 10 -(7 -  4x - x²) = x² + 8x - 9

10 - 7 + 4x + x² - x² - 8x = - 9

3 - 4x = - 9

- 4x = - 9 - 3

- 4x = - 12

x = 3

2)5y³ - (6y + 1) - (2y + 5y³) = 19

5y³ - 6y - 1 - 2y -  5y³ = 19

- 8y -1 = 19

- 8y = 19 + 1

- 8y = 20

y= - 2,5