I need help with finding a polynomial and using it to find a perimeter

$\begingroup$

So I need help with this problem, I’m new to polynomials. Can you also explain how to get the answer?

Find the polynomial that models the problem and use it to estimate the quantity:

A rectangle has a length of $x$ and a width of $5x^3 + 4 - x^2$. Find the perimeter of the rectangle when the length is 5 feet.

$\endgroup$ 2

1 Answer

$\begingroup$

The perimeter of a rectangle is $2($length$+$width$)$. Put the values of length and width. You'll get : Perimeter$=2×(x+5x^3+4-x^2)$. That's the polynomial of perimeter. Now put $x=5$, since the length$=5$. You'll get $2×(5+5×5^3+4-5^2) = 1218$. That's the required perimeter.

$\endgroup$ 4

Your Answer

Sign up or log in

Sign up using Google Sign up using Facebook Sign up using Email and Password Submit

Post as a guest

Post Your Answer Discard

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy