- #1
apiwowar
- 96
- 0
the function is c = 15te-.2t
the goal is to integrate it from t = 0 to t = 3
so to set up the integral i took out the 15 first so i got:
15 * integral from 0 to 3 of t*e-.2t
i set u = t and so du = dt
dv = e-.2tdt so v= -5e-.2t
so following the integration by parts formula i got:
15(-5*e-.2t + 5* integral of e-.2tdt
then after integrating the second part i got
15(-5e-.2t - 25e-.2t) evaluated from 0 to 3
when evaluated i got
(-123/4826181 - 205.8043635)-(-75-375) = 120.7130184
but that's wrong,
anyone have any hints or sees any mistakes that i made?
thanks
the goal is to integrate it from t = 0 to t = 3
so to set up the integral i took out the 15 first so i got:
15 * integral from 0 to 3 of t*e-.2t
i set u = t and so du = dt
dv = e-.2tdt so v= -5e-.2t
so following the integration by parts formula i got:
15(-5*e-.2t + 5* integral of e-.2tdt
then after integrating the second part i got
15(-5e-.2t - 25e-.2t) evaluated from 0 to 3
when evaluated i got
(-123/4826181 - 205.8043635)-(-75-375) = 120.7130184
but that's wrong,
anyone have any hints or sees any mistakes that i made?
thanks