Find the expression for the area tha needs to be re-carpeted

Question

The total area for both rooms is expressed as 2x^2+x+3 square meters.  The tile in the dining room was already replaced, so we know the area of that room is 2x^2_2x square meters

Answer 1

The remaining area to be carpeted is 2x²+x+3-(2x²-2x)=2x²+x+3-2x²+2x=3x+3 sq m.