A = [1 -2 3; 4 5 -6; -7 8 9];

% a. Extract rows 2 and 3, columns 1 and 2
B = A(2:3, 1:2);

% b. Raise each element of A to the -2 power
C = A.^(-2);

% c. Add the identity matrix to B
I = eye(2);
D = B + I;

% d. Multiply the first column by the first row
E = A(:,1) * A(1,:);

disp(A)
disp(B)
disp(C)
disp(D)
disp(E)