Question

Решите уравнение (х^2-2)(х+3)+(х^2+2)(х-3)=42

Answer 1

x^3 + 3x^2 - 2x - 6 + x^3 - 3x^2 + 2x - 6 = 42
2x^3 = 42 + 12
2x^3 = 54
x^3 = 27
x = 3