Simplify.
\[
\sqrt{45 x^{21}}
\]
Combining these simplifications, the given expression simplifies to \(3x^{10}\sqrt{5x}\).
Step 1 :The given expression is \(\sqrt{45 x^{21}}\).
Step 2 :First, we can break down the number 45 into 9 and 5, where 9 is a perfect square. So, \(\sqrt{45}\) can be simplified to \(3\sqrt{5}\).
Step 3 :Next, we simplify the variable \(x^{21}\). We can do this by dividing the exponent 21 by 2, which gives us 10 with a remainder of 1. This means that we can take \(x^{10}\) out of the square root, and \(x^{1}\) will remain inside the square root.
Step 4 :Combining these simplifications, the given expression simplifies to \(3x^{10}\sqrt{5x}\).