The rectangle below has an area of 81-x^2 square meters and a width of 9-x meters. What expression represents the length of the rectangle?

For this case we have that by definition, the area of a rectangle is given by:

Where:

w: Is the width of the rectangle

l: is the length of the rectangle

According to the data of the statement we have:

So, the length is given by:

We factor the numerator:

We simplify:

So, the length is

is only a line? i think so

what is the original number? you forgot to add it.