Question

Use MATLAB to plot the polynomials y = 3x⁴ - 6x³ + 8x² + 4x + 90 and z = 3x³ + 5x² - 8x + 70 over the interval -3 ≤ x ≤ 3. Properly label the plot and each curve. The variables y and z represent current in milliamperes; the variable x represents voltage in volts.

 

 

Answer 1

MATLAB syntax of the following is as follows:

 

>> a1 = [3,-6,8,4,90];

a2 = [3, 5, -8, 70];

x=[-3:0.01:3];

y = polyval(a1,x);

z = polyval(a2,x);

>> plot(x,y,x,z,\'--\');

>> xlabel(\'Voltage Volts\');

>> ylabel(\'Current milliamps\')

 

MATLAB plot is:

MATLAB syntax of the following is:

 

>> a1 = [3,-6,8,4,90];

a2 = [3, 5, -8, 70];