Energy and Power
$ x(t)=x^2\! $
and the limits are from 1 to 3
Energy calculation
$ E=\int_{1}^{3}\ |x ^2|^2\, dx , \,\! $
E= $ \int_{1}^{3}\ x ^4\, dx , \,\! $ E= $ \frac{1}{5}\! $ *$ ((3^5)\! $ - $ (1^5))\! $ E= $ \frac{1}{5}\! $*$ (243-1)\! $ E= $ 48.4\! $
