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 milliamps; the variable x represents voltage in volts.
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