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solution18

# solution18 - Solutions Solutions to Assignment#18 syms x...

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Unformatted text preview: Solutions % Solutions to Assignment #18 syms x % Prob. 1 (a) expand((x-3)*(x+3)*(x^2expand((x expand((x-3)*(x+3)*(x^2-1)) ans = x^4-10*x^2+9 (b) factor(x^3+5*x^2-2*xfactor(x^3+5*x^2 factor(x^3+5*x^2-2*x-24) ans = (x-2)*(x+4)*(x+3) (c) simplify(x^2*((x-3)*x+5)simplify(x^2*((x simplify(x^2*((x-3)*x+5)-3*(x+7)) ans = x^4-3*x^3+5*x^2-3*x-21 (d) collect(x^2*((x-3)*x+5)collect(x^2*((x collect(x^2*((x-3)*x+5)-3*(x+7)) ans = x^4-3*x^3+5*x^2-3*x-21 (e) pretty(x^3+5*x^2-2*xpretty(x^3+5*x^2 pretty(x^3+5*x^2-2*x-24) 3 2 x + 5 x - 2 x - 24 % Prob2 Prob2 syms x y z a b c d (a) solve(x^3+5*x^2-2*x-24) solve(x^3+5*x^2 solve(x^3+5*x^2-2*x-24) ans = 2 -3 -4 (b) solve(x^2-3*b*c*xsolve(x^2 solve(x^2-3*b*c*x-d,c) ans = 1/3*(x^2-d)/b/x (c) [x,y,z]=solve('3*x+2*y=0','x-y+2*z=3','2*x+2*y[x,y,z]=solve('3*x+2*y=0','x [x,y,z]=solve('3*x+2*y=0','x-y+2*z=3','2*x+2*y-4*z=5') x= 11/4 y= -33/8 z= -31/16 % Prob Prob syms x 3 yz (a) z=x*y^(1/2)z=x*y^(1/2) z=x*y^(1/2)-2/y; Dzy=diff(z,y) Dzy=diff(z,y) Dzy = 1/2*x/y^(1/2)+2/y^2 (b) clear clear all syms x y z z=x*y^(1/2)z=x*y^(1/2)-2/y; Dzx=diff(z,x) Dzx = y^(1/2) (c) clear clear all syms x y t y=x^2+tan(x) Dy=diff(y) y= x^2+tan(x) Dy = 2*x+1+tan(x)^2 (d) f=int(3*xf=int(3*x f=int(3*x-2/x) f= 3/2*x^2-2*log(x) (e) F=int(t^3+sin(t),t,1,3) F=int(t^3+sin(t),t,1,3) clear all F= 20+cos(1)-cos(3) Prob 4 syms syms x y (a) y=dsolve('Dy+3*x=2','x') y=dsolve('Dy+3*x=2','x') y= -3/2*x^2+2*x+C1 (b) y=dsolve('Dy+3*x=2','y(3)=2','x') y=dsolve('Dy+3*x=2','y(3)=2','x') y= -3/2*x^2+2*x+19/2 (c) y=dsolve('D2y+3Dy+2*y=0','y(0)=2','Dy(0)=0','x') y=dsolve('D2y+3Dy+2*y=0','y(0)=2','Dy(0)=0','x') y= -3/2+7/2*cos(2^(1/2)*x) Prob 5 ezplot('x^0.5',[0,3]) ezplot('x^0.5',[0,3]) xlabel('x'),ylabel('y') ...
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