Question

Do I just multiply?
The length of the side of a rectangular desk is given by 7x-9ycm. The length of front is given by 7x+9y cm. What is the algebraic expression for the area of the top of the rectangular desk? Include units as part of your answer.

Answer 1

Area= (7x-9)(7x-9)=49x^2-81 cm^2

Answer 2

a=l*w
a=(7x-9y)(7x+9y)
use FOIL method:

tyty doncatch thought so, just needed confirmation

Answer 3

yes, yes .. u got that..