Question: Plot the polynomial y = - 0 . 4 x 4 + 7 x 2 - 2 0 . 5 x - 2 8 in

Plot the polynomial y=-0.4x4+7x2-20.5x-28 in the domain -5x4. First create a vector for x, next use the polyval function to calculate y, and then use the plot function.
Plot the polynomial y = - 0 . 4 x 4 + 7 x 2 - 2 0

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