bttg13 - f=b-a; d=polyval(a,x) d...

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b=[2 5 -5 7]; x=linspace(-2,5,1000); c=polyval(b,x); c a=[0 -5 9 1]; d=polyval(a,x); d e=b+a;
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Unformatted text preview: f=b-a; d=polyval(a,x) d %plot(x,c,'-k',x,a,'-b',x,e,'-r',x,f,'-g') plot(x,e)...
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