Answer:E. (126 + 10.5x) square feet
Explanation:
The length of the living room is 12 feet.
The width of the living room is
10 1/2 feet = 10.5 feet.
The length of the room is being expanded by x feet. This means that the new length of the room would be
12 + x = (12 + x) feet
The formula for determining the area of a rectangle is expressed as
Area = L × width.
Therefore, an expression to represent the new area of the living room in square feet and the expanded form of the expression would be
Area = 10.5(12 + x)
Area = 126 + 10.5x