The sides of a rectangle are (2x + 2) cm and (5x + 7) cm. Which expression represents its area?
Note
Area of a rectangle is length × width. Multiply every part: (2x)(5x) = 10x^2, outside and inside terms add to 24x, and 2×7 = 14. So the area is 10x^2 + 24x + 14.