MATLAB - Problems

Please help, THANK YOU!

4. Define x as a symbolic variable and create two symbolic expressions: s, = x2 (x-5) + 7(3-4) S,-(x + 3)2-8x (a) Use symbolic operations to determine the simplest form of S, times S2 (b) Use symbolic operations to determine the simplest form of Si minus S2 (c) Use the subs command to calculate the numerical value of Si minus S2 when x 5