How to plot the function f(x)=x^3 - 4x^2 +1 for x∈[0,25]

x= 0:0.01:25. For y=x^3 - 4x^2 +1 your plot command will be variant of plot(x,y).

Answer 1

[pfb]

You almost got it. Since x is a vector, you should use elementwise operators. not x^2 (what's the square of a vector?) but x.^2.

[pfb]

also, you should write the multiplication operator (*) explicitly

 x= 0:0.01:25
 y=x.^3 - 4*x.^2 +1;

 plot(x,y);