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Sagot :
To solve the equation [tex]\(4^x = 20\)[/tex], we will use logarithms. Here is a step-by-step solution for this problem:
1. Start with the given equation:
[tex]\[ 4^x = 20 \][/tex]
2. Apply the logarithm to both sides of the equation. It is often easiest to use the common logarithm (base 10) or the natural logarithm (base [tex]\(e\)[/tex]), but for this solution, we'll use the common logarithm (base 10):
[tex]\[ \log(4^x) = \log(20) \][/tex]
3. Use the power rule of logarithms, which states that [tex]\(\log(a^b) = b \log(a)\)[/tex]:
[tex]\[ x \log(4) = \log(20) \][/tex]
4. Isolate [tex]\(x\)[/tex] by dividing both sides of the equation by [tex]\(\log(4)\)[/tex]:
[tex]\[ x = \frac{\log(20)}{\log(4)} \][/tex]
5. Now we need to evaluate the logarithms. Using a calculator:
[tex]\[ \log(20) \approx 1.3010 \][/tex]
[tex]\[ \log(4) \approx 0.6021 \][/tex]
6. Divide the two results to find [tex]\(x\)[/tex]:
[tex]\[ x = \frac{1.3010}{0.6021} \approx 2.1609640474436813 \][/tex]
7. Round the answer to two decimal places:
[tex]\[ x \approx 2.16 \][/tex]
Therefore, the solution to the equation [tex]\(4^x = 20\)[/tex] rounded to two decimal places is:
[tex]\[ \boxed{2.16} \][/tex]
So, the correct answer is:
C. [tex]\( x = 2.16 \)[/tex]
1. Start with the given equation:
[tex]\[ 4^x = 20 \][/tex]
2. Apply the logarithm to both sides of the equation. It is often easiest to use the common logarithm (base 10) or the natural logarithm (base [tex]\(e\)[/tex]), but for this solution, we'll use the common logarithm (base 10):
[tex]\[ \log(4^x) = \log(20) \][/tex]
3. Use the power rule of logarithms, which states that [tex]\(\log(a^b) = b \log(a)\)[/tex]:
[tex]\[ x \log(4) = \log(20) \][/tex]
4. Isolate [tex]\(x\)[/tex] by dividing both sides of the equation by [tex]\(\log(4)\)[/tex]:
[tex]\[ x = \frac{\log(20)}{\log(4)} \][/tex]
5. Now we need to evaluate the logarithms. Using a calculator:
[tex]\[ \log(20) \approx 1.3010 \][/tex]
[tex]\[ \log(4) \approx 0.6021 \][/tex]
6. Divide the two results to find [tex]\(x\)[/tex]:
[tex]\[ x = \frac{1.3010}{0.6021} \approx 2.1609640474436813 \][/tex]
7. Round the answer to two decimal places:
[tex]\[ x \approx 2.16 \][/tex]
Therefore, the solution to the equation [tex]\(4^x = 20\)[/tex] rounded to two decimal places is:
[tex]\[ \boxed{2.16} \][/tex]
So, the correct answer is:
C. [tex]\( x = 2.16 \)[/tex]
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