Guys, i have no idea how to proceed with these two questions, would you please help me out, many thanks guys.

[Adam Danz]

Check out linspace()

https://www.mathworks.com/help/matlab/ref/linspace.html

To plot p and q against x using unconnected points,

plot(x,q,'o')
hold on
plot(x,p,'s')

Also see the det() function.

Answer 1

[Stijn Haenen]

2.3:

syms k
vpasolve(det(R-k*i3)==13,k)