Решите плз X(x^2-2)=x^3+8 (x+5)(x-4)-x^2+18=0

Question

Решите плз
X(x^2-2)=x^3+8
(x+5)(x-4)-x^2+18=0

Answer 1

1) x(x² - 2) = x³ + 8
x³ - 2x = x³ + 8
x³ - 2x - x³ = 8
- 2x = 8
x = -4
2) (x + 5)(x - 4) - x² + 18 =0
x² - 4x + 5x - 20 - x² + 18 = 0
x - 2 = 0
x = 2