Advanced MathEasyArea of a rectangle as an expression
Advanced Math practice question
A rectangle has a length of 2x units and a width of 3 units. Which expression gives its area, in square units?
- A. 6xCorrect
- B. 2x + 3
- C. 5x
- D. 6x²
Answer: A. 6x
Area = length × width = 2x × 3 = 6x.
Why the other answers are wrong
- B. 2x + 3
- 2x + 3 adds the sides instead of multiplying.
- C. 5x
- 5x adds the coefficients 2 + 3.
- D. 6x²
- 6x² would need both sides to contain x.
More Advanced Math questions
- Easy
If f(x) = 3x − 7, what is the value of f(5)? - Easy
What are the solutions to x² − 9 = 0? - Easy
Which of the following expressions is equivalent to x² + 7x + 12 ? - Easy
The function g is defined by g(x) = x³ + 2x. What is the value of g(−2) ? - Easy
For x > 0, which of the following is equivalent to ∛(x⁵) ? - Easy
The function h is defined by h(x) = (x − 6)(x + 2). What is one value of x for which h(x) = 0 ?
Not affiliated with the College Board. SAT is a trademark of the College Board.