Fill in the blank so that the matrix below is symmetric. 128 9:? Select a blank to input an answer SAVE Let A be a square matrix. Prove that A + AT is always symmetric: m+AT:[j+Cj =AT+ :A+A? Therefore (A+AUT=A+AT and so A + AT is symmetric. \fFrom the 5 choices, select all that apply 0 O 0 0 1 0 0 0 0 0 -7 0 0 0 0 0 0 0 O 0 SAVE Let A = Fill in the blankLet A = 2 5 Then det(A) = Select a blank to input an answer SAVE Fill in the blank so that the following equation is true: = 3 21 2 2 Let A = 2 3 1 2 Compute det (A) by cofactor expanding along column 3. det(A) = + = 2 Select a blank to input an answer SAVE ? H To compute the determinant of an upper triangular matrix we should Drag or tap the options below to fill in the blanks add the diagonal entries. add the entries in the first row. multiply the diagonal entries. multiply the entries in the first row