exam Maths Puzzle Numerical Ability

How do I algebraically find x when x^4=16?

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exam Other Question

Okay this is a long one.
Q: Use the gauss jordon method to solve the system.
[1 5 -1 -4
0 3 -1 -1
-3 6 2 11] I started out by doing the gaussian method so this is Find all roots of the polynomial x^3-x^2+16x-16.

Thanks Very Much.