In the equation 4050 x = 450 , the value of x is = ?

Answer: Option C

$$\begin{array}{rl}& \frac{4050}{\sqrt{x}}=450\\ & \iff \sqrt{x}=\frac{4050}{450}\\ & \iff \sqrt{x}=9\\ & \iff x={\left(9\right)}^2\\ & \iff x=81\end{array}$$