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What is the solution to [tex]$4+5 e^{x+2}=11$[/tex]?

A. [tex]x=\ln \frac{7}{5}-2[/tex]
B. [tex]x=\ln \frac{7}{5}+2[/tex]
C. [tex]x=\ln 35-2[/tex]
D. [tex]x=\ln 35+2[/tex]


Sagot :

To solve the equation [tex]\(4 + 5e^{x+2} = 11\)[/tex], follow these steps:

1. Isolate the exponential term:
[tex]\[ 4 + 5e^{x+2} = 11 \implies 5e^{x+2} = 11 - 4 \implies 5e^{x+2} = 7 \][/tex]

2. Divide both sides by 5 to further isolate the exponential term:
[tex]\[ e^{x+2} = \frac{7}{5} \][/tex]

3. Take the natural logarithm of both sides:
[tex]\[ \ln(e^{x+2}) = \ln\left(\frac{7}{5}\right) \][/tex]

4. Use the property of logarithms [tex]\(\ln(e^y) = y\)[/tex] to simplify the left-hand side:
[tex]\[ x+2 = \ln\left(\frac{7}{5}\right) \][/tex]

5. Isolate [tex]\(x\)[/tex] by subtracting 2 from both sides:
[tex]\[ x = \ln\left(\frac{7}{5}\right) - 2 \][/tex]

After following these steps, we find that the solution is:
[tex]\[ x = \ln\left(\frac{7}{5}\right) - 2 \][/tex]

Therefore, among the given choices, the correct answer is:
[tex]\[ x = \ln\left(\frac{7}{5}\right) - 2 \][/tex]

So, the correct option is:
[tex]\[ \boxed{x = \ln\left(\frac{7}{5}\right) - 2} \][/tex]