How to solve

Problem $3($first order ODE Solving using $Rk-4)$: Solve the following DE from $t=0$ to $2\mathrm{.}00.$ Using a step size $t=0\mathrm{.}5.$ Show all details

$d\frac{y}{d}t=(1+4t)\sqrt[\phantom{2}]{y}$

With the initial Condition $)=(0.$ The exact solution to this problem is $y(t)=(1+\frac{t}{2}+t^2{)}^2.$ Use it to Calculate absolute error.