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The Correct Answer and Explanation is:
Example Problem (Based on Your Format):
Evaluate the expression: x=1+52x = \frac{1 + \sqrt{5}}{2}x=21+5
and round the result to the nearest hundredths place.
Step-by-Step Solution:
- Start by computing the square root: 5≈2.236\sqrt{5} \approx 2.2365≈2.236
- Plug into the expression: x=1+2.2362=3.2362x = \frac{1 + 2.236}{2} = \frac{3.236}{2}x=21+2.236=23.236
- Divide: x≈1.618x \approx 1.618x≈1.618
- Round to the nearest hundredths: x≈1.62\boxed{x \approx 1.62}x≈1.62
Explanation
This expression is commonly known as the golden ratio, often represented by the Greek letter ϕ\phiϕ. It arises in mathematics, art, architecture, and nature due to its unique aesthetic properties. In this exercise, we are evaluating the expression 1+52\frac{1 + \sqrt{5}}{2}21+5, and rounding the result to the nearest hundredths place.
To start, we estimate the square root of 5. Since 2² = 4 and 3² = 9, we know that 5\sqrt{5}5 is somewhere between 2 and 3. Using a calculator or long division method, we find 5≈2.236\sqrt{5} \approx 2.2365≈2.236.
Next, we add 1 to this value, giving 1+2.236=3.2361 + 2.236 = 3.2361+2.236=3.236. The final step is to divide this sum by 2, which results in 3.2362≈1.618\frac{3.236}{2} \approx 1.61823.236≈1.618.
Now we apply rounding. Since the thousandths digit is 8 (greater than 5), we round the hundredths digit up. So, 1.618 becomes 1.62 when rounded to the nearest hundredths place.
Rounding to a specific decimal place is common in real-world contexts where precision matters but infinite decimal expansions are impractical. By limiting our result to two decimal places, we make the number easier to use, especially in measurements or financial calculations.
In conclusion, the value of 1+52\frac{1 + \sqrt{5}}{2}21+5 rounded to the hundredths place is 1.62.
