Making graph for quadratic function

I'm very new to MatLab and I am having some difficulty creating the code and just understanding what to put where. I got my quadratic formula to run and loop(Ex 4.2), but now I've been asked to have a function to plot the graph of the formula.

These are my instructions:

Meet all the requirements of Ex 4.2 • Prompt the user for the vector of X values at which the quadratic will be evaluated. Note: the statement: XVec = input(‘Enter X vector’); Will quite happily deal with any valid Matlab vector specification. For example, inputting: -100:10:100 will give you a vector of numbers from -100 to 100 in increments of 10. • Plot the graph, label the X and Y axes, and add a title.

This makes me more confused as I don't know where to add these new statements, and the quadratic formula gives 2 values for x, how do I even get all of this input working??

[Khairul Azam]

i realy tired to alive... can you give me some advice