The expression $\left(3 x^{4}\right)^{2}$ can be written in the form $3^{a} x^{b}$ where:
- $a=$
Preview
- $b=$
Preview

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Final Answer: $b=\boxed{8}$

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Step 1 ：The given expression is $\left(3 x^{4}\right)^{2}$.

Step 2 ：We can simplify this expression by applying the power of a power rule in exponents, which states that $(a^{m})^{n} = a^{mn}$. Here, $a$ is $3x^{4}$ and $n$ is $2$.

Step 3 ：So, we can rewrite the expression as $3^{2} x^{4*2}$.

Step 4 ：Final Answer: $a=\boxed{2}$

Step 5 ：Final Answer: $b=\boxed{8}$

The expression $\left(3 x^{4}\right)^{2}$ can be written in the form $3^{a} x^{b}$ where:- $a=$Preview- $b=$Preview

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The expression $\left(3 x^{4}\right)^{2}$ can be written in the form $3^{a} x^{b}$ where:
- $a=$
Preview
- $b=$
Preview