# help with analysis of equations

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jessica am 24 Jul. 2013
if true
fplot('x^2-5*x*sin(3*x)+3',[0,10]);
disp('positive roots of the equation are')
x1=fzero('x^2-5*x*sin(3*x)+3',2)
x2=fzero('x^2-5*x*sin(3*x)+3',2.7)
end
determine the positive roots of the equation
x^2-5*x*sin(3*x)+3
2.3656
2.8435
I keep getting this two and my book says there should be 4 3.8;3.4;1.8;1.3
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### Antworten (1)

Narges M am 24 Jul. 2013
Try this:
if true
fplot('x^2-5*x*sin(3*x)+3',[0,10]);
disp('positive roots of the equation are')
hold on;
plot(0:10,zeros(1,11), '--c');
x1=fzero('x^2-5*x*sin(3*x)+3',2)
x2=fzero('x^2-5*x*sin(3*x)+3',2.7)
plot(x1,0,'rX', 'MarkerSize',8);
plot(x2,0,'rX', 'MarkerSize',8);
end
As you see, this function only has these roots, and is different from the one in your book.
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