Chapter 26, Problem 7P

Solve the following initial-value problem from $t=4\text{ to 0}\text{.75}$:

$\frac{dy}{dx}=y{x}^2-y$

Use the non-self-starting Heun method with a step size of 0.25. If $y\left(0\right)=1$, employ the fourth-order RK method with a step size of 0.25 to predict the starting value at $\left(0.25\right)$.