Getting the same incorrect plot with exponential function

I need to plot this function:

y= e^(2x)-3*e(x)

But matlab keeps showing me the incorrect plot, I mean the same incorrect one even if I change the function.

Answer 1

[Image Analyst]

That is the correct plot for that equation. What were you expecting? Why do you say it's wrong?

x = linspace(0, 10, 1000);
y = exp(2 * x) - 3 * exp(x);
plot(x, y, 'b-', 'LineWidth', 2);
grid on;
xlabel('x', 'FontSize', 18)
ylabel('y', 'FontSize', 18)

And if I change the equation, the plot looks different.

Answer 2

[Walter Roberson]

y = @(x) exp(2*x)-3*exp(x)

y = function_handle with value:
    @(x)exp(2*x)-3*exp(x)

exp(2*10)

ans = 4.8517e+08

fplot(y, [-2 10])

Looks correct to me. You are asking to plot up to