Answer :
You take the antiderivative of acceleration twice putting in initial values where appropriate as constants of integration.
a=8t+5
v=4t^2+5t+4
s=4/3t^3+5/2t^2+4t+12
a=8t+5
v=4t^2+5t+4
s=4/3t^3+5/2t^2+4t+12