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What is the simplest form of the given equation [tex]\frac{3-\sqrt{5}}{\sqrt{5}}[/tex]?

A. [tex]\frac{3 \sqrt{5}-5}{5}[/tex]

B. [tex]\frac{3 \sqrt{3}-\sqrt{15}}{5}[/tex]

C. [tex]\frac{5 \sqrt{3}-5}{5}[/tex]

D. [tex]\frac{14-6 \sqrt{5}}{5}[/tex]


Sagot :

To determine the simplest form of the given expression [tex]\(\frac{3-\sqrt{5}}{\sqrt{5}}\)[/tex], we'll follow these steps:

1. Original Expression:
[tex]\[ \frac{3 - \sqrt{5}}{\sqrt{5}} \][/tex]

2. Rationalizing the Denominator: We multiply the numerator and the denominator by [tex]\(\sqrt{5}\)[/tex] to rationalize it.
[tex]\[ \frac{(3 - \sqrt{5}) \cdot \sqrt{5}}{\sqrt{5} \cdot \sqrt{5}} = \frac{(3 \sqrt{5} - 5)}{5} \][/tex]

3. Simplified Expression: The rationalized form of the expression is:
[tex]\[ \frac{3 \sqrt{5} - 5}{5} \][/tex]

Now, we compare this result with the given options:

- Option 1: [tex]\(\frac{3 \sqrt{5} - 5}{5}\)[/tex]
- Option 2: [tex]\(\frac{3 \sqrt{3} - \sqrt{15}}{5}\)[/tex]
- Option 3: [tex]\(\frac{5 \sqrt{3} - 5}{5}\)[/tex]
- Option 4: [tex]\(\frac{14 - 6 \sqrt{5}}{5}\)[/tex]

From our simplified expression, we see that it matches exactly with Option 1:
[tex]\[ \frac{3 \sqrt{5} - 5}{5} \][/tex]

Thus, the simplest form of the expression [tex]\(\frac{3-\sqrt{5}}{\sqrt{5}}\)[/tex] from the given options is:
[tex]\[ \frac{3 \sqrt{5} - 5}{5} \][/tex]

Therefore, the correct answer is:
[tex]\[ \boxed{\frac{3 \sqrt{5} - 5}{5}} \][/tex]
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