Matrix

We are given the equations and . To find , we can add these two equations:

This simplifies to:

Thus,

Now, subtract from :

This gives:

so

Thus, the correct answer is (A).

Final Answer:

Step 1: Multiply matrices and . Perform multiplication:
Step 2: Define .

Step 3: Compute determinant of .
Wait, let’s double-check carefully : Earlier, I thought it was 14 — but recalc gives: So correct value is **50**, not 14. Final Answer: