Write a function rule for the area of a rectangle whose length is 7 ft more than its width. What is the area of the rectangle when its width is 12 ft? Write a function for the area A of the rectangle using the independent variable width W.
The expression for the area in terms of the width is:
We know that the formula for the area of a rectangle is:
Area = length x width
In this specific case, though, we are told that the length is
We can substitute this value for
This expression is the answer to the final sentence in the question, asking us to write an expression for
Now we can use our expression to find the area in the situation where