the displacement is given by x=2t2+t+5.the acceleration at t=2s is

We know that for finding accelertion if we are given with displacement as a function of time then we undergo successive differentiation or double differentiation The equation is given as x=2t2+t2+5 first we differentiate it so as to find velocity we get dx/dt =4t+1 then we differntiate this to yield acceleration dv/dt=4 which is the answer plz approved me