The sides of a rectangle are (9x + 8) cm and (6x + 3) cm. Which expression represents its area?
Note
Area of a rectangle is length × width. Multiply every part: (9x)(6x) = 54x^2, outside and inside terms add to 75x, and 8×3 = 24. So the area is 54x^2 + 75x + 24.