Question 733954
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(-16)}}}
using i, the square root of -1
x = +/-4i