To simplify the expression \( 2^{x^4} \times 2^{x^2} \) using the Product Rule of Exponents, we can combine the exponents, since they have the same base.
The Product Rule states that \( a^m \times a^n = a^{m+n} \).
In this case, we have:
\[ 2^{x^4} \times 2^{x^2} = 2^{x^4 + x^2} \]
So, the expression simplifies to:
\[ 2^{x^4 + x^2} \]
That's the final simplified expression.