How can I draw graph of y^2=x^2 * (x+3)?

Answer 1

[Sam Chak]

Hi @Lê

The fimplicit() function can be used.

f = @(x, y) y.^2 - (x.^2).*(x + 3);
fimplicit(f), grid on
xlabel('x'), ylabel('y')

[Lê]

Thank you @Sam Chak, also ìf I want to find the area enclosed by the loop, how can I write it in MATLAB, knowing the area is the image attached?

[John D'Errico]

PLease @Sam Chak, don't just do obvious homework assignments. This does not help the student. When the student has not made even a hint of an effort, you should not do their work for them. This teaches the student nothing, except how to get someone to do their homework.

[Sam Chak]

Hi @Lê

The original question about the implicit plot has been adequately answered. I believe not many students are aware that it involves an implicit function. However, I agree with @John D'Errico's point, and it's fair to inquire about where to find information regarding the integral. Perhaps you didn't use the correct keywords when searching on Google.

There are both symbolic and numerical approaches. Since the problem of finding the area involves a definite integral, I suggest using the integral() command directly. Click on the link to see some examples:

https://www.mathworks.com/help/matlab/ref/integral.html

Please share your MATLAB code here, and you will get a sense of achievement.

[Walter Roberson]

See int