To simplify (xy^3z^4)^4, we need to raise each term inside the parentheses to the power of 4.
Using the exponent rule for raising a power to a power, we can multiply the exponents.
So, (xy^3z^4)^4 = (x^1y^3z^4)^4
Now, we can distribute the exponent 4 to each term inside the parentheses:
(x^1)^4 * (y^3)^4 * (z^4)^4
Simplifying further:
x^4 * y^12 * z^16
Therefore, the simplified form of (xy^3z^4)^4 is x^4y^12z^16.