Question 219137
3x^4 = 81x


3x^4 - 81x = 0


3x(x^3 - 27) = 0


3x(x-3)(x^2+3x+9) = 0


3x=0, x-3=0, x^2+3x+9=0


Answers:


x=0, x=3, -3/2+(3/2)*i*sqrt(3), -3/2-(3/2)*i*sqrt(3)