The sides of a rectangle are (9x + 2) cm and (8x + 7) cm. Which expression represents its area?
Note
Area of a rectangle is length × width. Multiply every part: (9x)(8x) = 72x^2, outside and inside terms add to 79x, and 2×7 = 14. So the area is 72x^2 + 79x + 14.