To answer this question, we have to follow the next steps:
1. We have:
[tex]a=9b^2c[/tex]
2. Divide both sides by 9c:
[tex]\begin{gathered} \frac{a}{9c}=\frac{9b^2c}{9c}=\frac{9c}{9c}b^2 \\ \frac{a}{9c}=b^2 \end{gathered}[/tex]
3. Take the square root to both sides as follows:
[tex]\begin{gathered} \frac{a}{9c}=b^2 \\ b^2=\frac{a}{9c} \\ \sqrt[]{b^2}=\pm\sqrt[]{\frac{a}{9c}} \\ \\ \\ \\ \end{gathered}[/tex]
