Please Help!!!!
A rectangular swimming pool has a perimeter of (x^3-23x^2-17x+2) feet and a width of x feet. Find the perimeter of the pool when the width is 24 feet.

Question

Please Help!!!!
A rectangular swimming pool has a perimeter of (x^3-23x^2-17x+2) feet and a width of x feet.  Find the perimeter of the pool when the width is 24 feet.

mathmale · Answer

It may help you to write out the formula for the perimeter of a rectangle first.

nicoledonley · Answer

I think I'm doing it wrong because I still do not understand it

mathmale · Answer

A rectangle of length L and width W has perimeter P = 2L + 2W.  This is the usual formula.

However, in the problem you're trying to solve, you're given a third-order polynomial which represents the perimeter.

We're told that this perimeter (as a function of x alone) is P = x^3-23x^2-17x+2, and also that the width of the pool is x.  Simply let x = 24 ft and calculate P.  In other words, substitute 24 ft for x in the equation for P.