If x * y = x2 + y2 - xy, then the value of 9 * 11 is?

Answer: Option B

$$\begin{array}{rl}& \\ & x\ast y=x^2+y^2-xy\\ & 9\ast 11={\left(9\right)}^2+{\left(11\right)}^2-11\times 9\\ & \Rightarrow 9\ast 11=81+121-99\\ & \Rightarrow 9\ast 11=103\end{array}$$