Only brief answers and SHORT explainations are required. Q17

2+22 4 -62 -7+62 Find the (1, 1)-cofactor of A = -2+72 4+71 -2+7i -1+2 3+21 -2+62 C11 =Find the inverse of -2 - . 3 7 OO A = 3 0 co by the cofactor method where the adjugate matrix is given by 1 1 0 -2 -2 0 -1 -1 adj (A) = 4 7 -1 2 H Enter an exact answer. You can simplify your answer by taking a common factor out of your matrix. 12 1 2 For example instead of or you could enter . Any of those forms would be marked correctly. 8 6 A =