Melissa and her husband are each starting a saving plan. Melissa will initially set aside and then add every week to the savings. The amount (in dollars) saved this way is given by the function, where is the number of weeks she has been saving. Her husband will not set an initial amount aside but will add to the savings every week. The amount (in dollars) saved using this plan is given by the function.

Let be the total amount (in dollars) saved using both plans combined. Write an equation relating to. Simplify your answer as much as possible.