Answer:
for 3 by 3 matrix you can find the inverse matrix or the determinant. We will find the determinant for this one. Let's just say that we have a random matrix, To solve it we first use appropriate notation then we copy the first 2 columns to the right. We multiply the top ones first going from up to down, then we write it at the bottom of what you are drawing on. Next you multiply the bottoms, don't forget to also include the columns that were copied over! Then you put a subtraction sign, but then you put adding signs between your partial products. Finally, you subtract the bottom sum from the top sum to find the determinant.