Hi, I would like to ask if my answer is correct or not, here is the question.

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Erwin Koman 2015-6-27

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评论： Erwin Koman 2015-6-27

Untitled.png

Here is my Code

% Graphical method to solve x.^4 + x.^3 - 2*x.^2 +1
x = -5:.1:5;
f = inline('x.^4 + x.^3 - 2*x.^2 +1');
plot(x,f(x))
xlabel('x');ylabel('f(x)')
grid;zoom on

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Answer 1

Salaheddin Hosseinzadeh 2015-6-27

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编辑：Salaheddin Hosseinzadeh 2015-6-27

Hi,

Looks alright.

You can use xlim, ylim to limit the view and see the zero crossing location better, however assuming that we don't know where is the zero then you can manually zoom to find it or

ylim([-0.2,0.2]); %this helps you see the zero crossing better

Good luck ;)