SOLUTION: X to the third power plus 16x = 0. Solve. We are using factoring and i don't understand this problem.

Algebra ->  Polynomials-and-rational-expressions -> SOLUTION: X to the third power plus 16x = 0. Solve. We are using factoring and i don't understand this problem.      Log On


   

Question 733954: X to the third power plus 16x = 0. Solve. We are using factoring and i don't understand this problem.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
X to the third power plus 16x = 0. Solve.
:
x^3 + 16x = 0
Factor out x
x(x^2 + 16) = 0
only one real solution
x = 0
but also
x^2 = -16
x = +/-sqrt%28-16%29
using i, the square root of -1
x = +/-4i