Im not sure why my answer is incorrect. Is it because in my second step I replaced row 2 with 2 times row 2 minus r1 which means the final answer would have to be divided by two.

on a seperate question i replaced a row with itself plus a scalar multiple of another row and i didnt have to put factor out the scalar multiple so i am unsure when i have to do so when finding the determinant. Thank you

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