To simplify the expression, we need to apply the exponent to each term inside the parentheses.
(7^2y^3z^4)^2 becomes:
7^(2*2) * (y^3*2) * (z^4*2)
Simplifying the exponents:
7^4 * y^6 * z^8
Therefore, the simplified expression is 7^4 * y^6 * z^8.
(7^2y^3z^4)^2
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