3. Use Euler's method to approximate the value of = -2x3 + 12x2 - 20x +8.5 from x = 0 to x = 4. The initial condition is y(0) = 1. Use the following step size: a. h= 0.5 b. h = 0.25 C. h=0.1 d. Compute for the true error and relative percentage error using the true value of y = -0.5x* + 4x3 + 8.5x + 1 at x-4 for each given steps.

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