Let's determine the radius of the base of the cone given the volume and the height.
### Step-by-Step Solution:
1. Given Information:
- Volume of the cone: [tex]\( V = 3 \pi x^3 \)[/tex] cubic units
- Height of the cone: [tex]\( h = x \)[/tex] units
2. Formula of the Volume of a Cone:
The volume [tex]\( V \)[/tex] of a cone is given by the formula:
[tex]\[
V = \frac{1}{3} \pi r^2 h
\][/tex]
where [tex]\( r \)[/tex] is the radius of the base and [tex]\( h \)[/tex] is the height of the cone.
3. Substitute the Given Values:
- Substitute [tex]\( V = 3 \pi x^3 \)[/tex] and [tex]\( h = x \)[/tex] into the formula:
[tex]\[
3 \pi x^3 = \frac{1}{3} \pi r^2 x
\][/tex]
4. Simplify the Equation:
- Multiply both sides by 3 to eliminate the fraction:
[tex]\[
9 \pi x^3 = \pi r^2 x
\][/tex]
- Divide both sides by [tex]\( \pi \)[/tex] to cancel [tex]\( \pi \)[/tex]:
[tex]\[
9 x^3 = r^2 x
\][/tex]
5. Solve for [tex]\( r \)[/tex]:
- Divide both sides by [tex]\( x \)[/tex] (assuming [tex]\( x \neq 0 \)[/tex]):
[tex]\[
9 x^2 = r^2
\][/tex]
- Take the square root of both sides to solve for [tex]\( r \)[/tex]:
[tex]\[
r = \sqrt{9 x^2}
\][/tex]
6. Simplify the Square Root:
[tex]\[
r = 3 x
\][/tex]
### Conclusion:
The radius of the base of the cone is [tex]\( 3 x \)[/tex] units.
So, the correct choice is:
[tex]\[ 3 x \][/tex]
The answer is [tex]\( 3 x \)[/tex].
