Question:
Mark the tick against the correct answer in the following:
The solution set of the equation $\left|\begin{array}{ccc}\mathrm{x} & 3 & 7 \\ 2 & \mathrm{x} & 2 \\ 7 & 6 & \mathrm{x}\end{array}\right|=0$ is
A. $\{2,-3.7\}$
B. $\{2,7,-9\}$
C. $[-2,3,-7\}$
D. none of these
Solution:
