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Find the solution of the exponential equation

[tex]\[ 11 e^x = 4 \][/tex]

in terms of logarithms, or correct to four decimal places.

[tex]\[ x = \square \][/tex]


Sagot :

To solve the exponential equation [tex]\(11e^x = 4\)[/tex] for [tex]\(x\)[/tex], follow these steps:

1. Isolate the exponential expression: Divide both sides of the equation by 11 to isolate the term involving the exponent.
[tex]\[ e^x = \frac{4}{11} \][/tex]

2. Apply the natural logarithm to both sides: The natural logarithm, denoted as [tex]\(\ln\)[/tex], is the inverse of the exponential function. Taking the natural logarithm of both sides will help to solve for [tex]\(x\)[/tex].
[tex]\[ \ln(e^x) = \ln\left(\frac{4}{11}\right) \][/tex]

3. Simplify using the property of logarithms: The natural logarithm of [tex]\(e^x\)[/tex] is simply [tex]\(x\)[/tex], because [tex]\(\ln(e^x) = x\ln(e) = x\)[/tex].
[tex]\[ x = \ln\left(\frac{4}{11}\right) \][/tex]

4. Calculate the value: Using a calculator to find the natural logarithm of [tex]\(\frac{4}{11}\)[/tex], we get:
[tex]\[ x \approx -1.0116 \][/tex]

Thus, the solution to the equation [tex]\(11e^x = 4\)[/tex] is:
[tex]\[ x \approx -1.0116 \][/tex]