Advanced MathEasyChecking which value solves a quadratic
Advanced Math practice question
Which of the following values of x satisfies x² = 2x + 8?
- A. 4Correct
- B. 2
- C. 8
- D. −4
Answer: A. 4
4² = 16 and 2(4) + 8 = 16.
Why the other answers are wrong
- B. 2
- 2² = 4 but 2(2) + 8 = 12.
- C. 8
- 8² = 64 but 2(8) + 8 = 24.
- D. −4
- (−4)² = 16 but 2(−4) + 8 = 0.
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