If (73)2 is subtracted from the square of a number, the answer so obtained is 5075. What is the number ?

Answer: Option C

Let the number be x
Then,
$$\begin{array}{rl}& \iff x^2-{\left(73\right)}^2=5075\\ & \iff x^2-5329=5075\\ & \iff x^2=5075+5329\\ & \iff x^2=10404\\ & \iff x=\sqrt{10404}\\ & \iff x=102\end{array}$$