Advanced MathEasyLength of a rectangle from its area
Advanced Math practice question
The area of a rectangle is x² + 3x, and its width is x. Which expression gives its length?
- A. x + 3Correct
- B. x² + 3
- C. 3x
- D. x + 3x
Answer: A. x + 3
Area ÷ width: (x² + 3x)/x = x + 3.
Why the other answers are wrong
- B. x² + 3
- x² + 3 times x would be x³ + 3x.
- C. 3x
- 3x times x is 3x², not x² + 3x.
- D. x + 3x
- x + 3x is 4x, and 4x times x is 4x².
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