69 linear algebra

Look close at the answer that I got correct. this is the only acceptable format

Entered Answer Preview Result ([(-12)"n]-3*(12^n))/6 (-12)" - 3 . 12" 6 incorrect [9*([(-12)^n]+(12^n))]/6 9((-12)" + 12" ) incorrect 6 ([(-12)"n]-(12^n))/6 (-12)" - 127 correct 6 (-3*[(-12)"n]+(12^n))/6 3(-12)" + 127 incorrect 6 At least one of the answers above is NOT correct. (1 point) If n is a positive integer, then -24 108 7 -4 24 is ((-12)n-(12)^n)/6 (Hint: Diagonalize the matrix -24 108 -4 24. first. Note that your answer will be a formula that involves n. Be careful with parentheses.)