Use \n inside you string to have a newline
Example:
input(['Please enter the coefficients for the polynomial of the form ax^2 + bx + c = 0.',...
'\nInput all three values in this form [a b c].',...
'\nIf a term is missing, use zero as a placeholder.',...
'\nInput values (include square brackets): '])
Note that I broke the string for better readability. For instance if you remove the \n, even if you have on different lines in the editor, it will still be a single line in the command window.
