# Chapter 4 - Quadratic Functions and Equations - 4-6 Complete the Square - Practice and Problem-Solving Exercises - Page 237: 18

The dimensions are $6\times12\times30$

#### Work Step by Step

We know that the side lengths are $6, x,$ and $2.5x$. The formula for the volume of a rectangular prism is $lwh$. So, our equation is $6\times x\times2.5x=2160$, which equals $15x^2=2160$. Then, we divide both sides by 15 to isolate $x^2$ to get $x^2=144$. Take the square root of both sides to get $x=\pm12$. The answer is 12 because the length of a pool can't be negative. Now, we substitute 12 into $x$ and $2.5x$, which were the dimensions that we determined in the beginning. $x=12$ $2.5(12)=30$

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.