Question 167367
Find all the fourth roots of 16. There are four solutions: 2, -2, i, i.
---------------------
{{{x^4 = 16}}}
{{{x^4-16 = 0}}}
{{{(x^2-4)*(x^2+4) = 0}}}
For {{{(x^2-4) = 0}}}, x = 2, x = -2
For {{{(x^2+4) = 0}}}, x = 2i, x = -2i