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Multiple Choice
Solve the given quadratic equation using the square root property. (x−21)2−5=0
A
x=21+5,x=21−5
B
x=25,x=−25
C
x=25,x=−25
D
x=21,x=−21
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Verified step by step guidance
1
Start by isolating the squared term. The given equation is \((x - \frac{1}{2})^2 - 5 = 0\). Add 5 to both sides to get \((x - \frac{1}{2})^2 = 5\).
Apply the square root property, which states that if \(a^2 = b\), then \(a = \pm \sqrt{b}\). Here, set \(x - \frac{1}{2} = \pm \sqrt{5}\).
Solve for \(x\) by adding \(\frac{1}{2}\) to both sides of the equation. This gives \(x = \frac{1}{2} + \sqrt{5}\) and \(x = \frac{1}{2} - \sqrt{5}\).
These two expressions represent the solutions to the quadratic equation. The solutions are \(x = \frac{1}{2} + \sqrt{5}\) and \(x = \frac{1}{2} - \sqrt{5}\).
Verify the solutions by substituting them back into the original equation to ensure they satisfy \((x - \frac{1}{2})^2 - 5 = 0\).