# The area of a rectangular serving tray is #3x^2+17x-56#. The width of the tray is #x+8#. What is the length of the tray?

##### 1 Answer

May 27, 2017

#### Explanation:

First and foremost, factorise the area.

Now, in order to factorise that, we must use the cross-multiplication method:

On the left-hand side,

Thus

We know that

Therefore,

So