PSAT Math Multiple-Choice Question 249: Answer and Explanation
Question: 249
2x2 -70 = 2 Solve the equation by any method.
- A. ±2
- B. ±4
- C. ±6
- D. ±8
Correct Answer: C
Explanation:
The correct solutions are ±6. Solve this equation by the square root method.
2x2 = 72 | Add 70 to both sides of the equation. |
x2 = 36 | Divide both sides of the equation by 2. |
x = ±6 | Apply the square root to both sides of the equation. |
See Lesson: Powers, Exponents, Roots, and Radicals.
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