Pregunta
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Ayana and Leah were trying to solve the equation: \( (x-5)^{2}+4=16 \) Ayana said, "I'll take the square root of both sides and rewrite the equation as \( (x-5)+2=4 \). Then I'll solve for \( x \)." Leah said, "IIl isolate \( (x-5)^{2} \) by subtracting 4 from both sides of the equation. Then l'll solve by taking the square root." Whose solution strategy would work?

Ask by Mann Ortega. in the United States
Feb 22,2025

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Leah's solution strategy works correctly.

Solución

Ayana’s strategy is not correct. The mistake is that you cannot take the square root of a sum term-by-term. That is, √[(x – 5)² + 4] is not the same as √[(x – 5)²] + √4. Leah’s strategy, on the other hand, is correct. Here’s how it works: 1. Start with the original equation:   (x – 5)² + 4 = 16 2. Subtract 4 from both sides to isolate the squared term:   (x – 5)² = 12 3. Then take the square root of both sides. Remember to consider both the positive and negative roots:   x – 5 = ±√12 4. Simplify √12 (if needed, as 2√3):   x – 5 = ±2√3 5. Finally, solve for x by adding 5 to both sides:   x = 5 ± 2√3 Thus, Leah’s approach correctly solves the equation, while Ayana’s does not.

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The Deep Dive

Leah's strategy is the correct approach! By first subtracting 4 from both sides, she gets \( (x-5)^{2} = 12 \). Then, taking the square root of both sides gives her two equations to solve, \( x-5 = \sqrt{12} \) and \( x-5 = -\sqrt{12} \). This ensures all potential solutions are considered. Ayana's error comes from incorrectly manipulating the equation after applying the square root. By adding 2 instead of isolating \( (x-5)^{2} \) first, she misses the necessary derivations needed to solve the equation thoroughly. Solving equations often requires following the correct order of operations, so don't skip any crucial steps!

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