The length of a rectangular room is 9 less than four times the width, #w#, of the room. What expression represents the area of the room?
1 Answer
Dec 18, 2017
OK, we know two things at the outset, but need them translating into algebra.
Explanation:
Firstly, we know the area of a rectangle is length, l x width, w.
Secondly, we are told that the length is 9 units less than 4 times the width, so
Thus the area,
Substitution gives:
Expanding the bracket yields: