Advanced MathEasy–MediumExpanding then subtracting a square term
Advanced Math practice question
Which expression is equivalent to 2x(3x − 4) − x²?
- A. 5x² − 8xCorrect
- B. 6x² − 8x
- C. 5x² − 4
- D. 5x² − 8
Answer: A. 5x² − 8x
6x² − 8x − x² = 5x² − 8x.
Why the other answers are wrong
- B. 6x² − 8x
- This forgets to subtract x².
- C. 5x² − 4
- 2x times −4 is −8x, not −4.
- D. 5x² − 8
- The −8 must carry the x.
More Advanced Math questions
- Easy–Medium
If f(x) = 2x² − 3, what is f(4)? - Easy–Medium
Which expression is equivalent to (2x³)(3x⁴)? - Easy–Medium
What are the solutions to x² − 16 = 0? - Easy–Medium
Which expression is equivalent to (x + 5)²? - Easy–Medium
For x ≠ 0, which expression is equivalent to (x² + 3x) / x? - Easy–Medium
What are the solutions to the equation 2(x − 3)² − 32 = 0 ?
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