Advanced MathEasy–MediumArea of a rectangle as a polynomial
Advanced Math practice question
A rectangle has a length of 3x + 2 units and a width of x units. Which expression represents the area of the rectangle, in square units?
- A. 3x² + 2xCorrect
- B. 4x + 2
- C. 8x + 4
- D. 3x² + 2
Answer: A. 3x² + 2x
Area is length times width: x(3x + 2) = 3x² + 2x.
Why the other answers are wrong
- B. 4x + 2
- This adds the length and width instead of multiplying.
- C. 8x + 4
- This is the perimeter.
- D. 3x² + 2
- This forgets to multiply the 2 by x.
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