Respuesta :

Answer:

x = 2.25 (Approximately)

Step-by-step explanation:

4 + 3x^4 = 81

4 - 4 + 3x^4 = 81 - 4

3x^4 = 77

(3x^4)/3 = 77/3

x^4 = 25.67 (Approximately)

x = 2.25 (Approximately)