Advanced MathEasy–MediumValue satisfying a quadratic and a linear condition
Advanced Math practice question
Which value of x satisfies both x² = 16 and x + 3 = 7?
- A. 4Correct
- B. -4
- C. 10
- D. 8
Answer: A. 4
x² = 16 gives 4 or −4, and x + 3 = 7 picks out 4.
Why the other answers are wrong
- B. -4
- −4 satisfies x² = 16 but not x + 3 = 7.
- C. 10
- 10 satisfies neither.
- D. 8
- 8 satisfies neither.
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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