show steps pls

4. Suppose that there are T periods to maximize over. Show that the intertemporal budget constraint is Ct+1 Ct+2 Yt+ 2 Y+T+1 +...+. Ct+T+1 = Y+ + Yt+1 + + ... + Ct + + ( 1 +r ) 2 ( 1 +r ) 1 (1 +r ) ( 1 +7 ) 2 ( 1 +r ) I (1 +r)