please solve all questions

Q2:-Solve this equation by using matlab without find value. Equation = (3x3-5x2+2x-12) Q3:-(A) is matrix in period (1:5:27) arrange them perpendicular and then find :- diag(A), sum(A), size(A), (A.^2). Note :- You could make matrix of (2*3). Q4:-The steady-state current (1) Flowing in a circuit that contains a resistance R=4 Capacities C33, and inductance L=8 in series is given by:- E I = Where E=5 and W=2, write program to calculate and R2+(2rWL-2rwca display the value of (I)