How would I plot the function p(x)=e^(-0.5x)*(4-x)-2 in the range of -2 to 10 as well as its derivative?

Question

Jennifer 2023-2-9

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https://ww2.mathworks.cn/matlabcentral/answers/1909900-how-would-i-plot-the-function-p-x-e-0-5x-4-x-2-in-the-range-of-2-to-10-as-well-as-its-derivat

编辑： Les Beckham 2023-2-9

How would I plot the function p(x)=e^(-0.5x)*(4-x)-2 in the range of -2 to 10 as well as its derivative? When I run it I get an invalid operator so I assumed I had to use . after the variables but that gives me the error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters. Can someone please help me out.

x = -2:0.1:10;
p = (exp(-0.5*x.)*(4-x.))-2;
Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.
pp = 0.5*exp(-0.5*x.)*x.-3*exp(-0.5*x.);
plot(x,p)