9x^2 - x^3 - 54x + 81 = 0

Question

9x^2 - x^3 - 54x + 81 = 0

Answer 1

9х²-х³-54х+81=0
9(х²-6х+9)=х²
9(х-3)²=х²
3(х-3)=х
3х-9=х
2х=9
х=4,5

Comments

Спасибо))