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

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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');
grid;zoom on

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Salaheddin Hosseinzadeh
Salaheddin Hosseinzadeh am 27 Jun. 2015
Bearbeitet: Salaheddin Hosseinzadeh am 27 Jun. 2015
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 ;)

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