Solve the equation .
Solve the equation by following steps:
step0: Solve for :
step1: Find the domain:
step2: Transform the expression:
step3: Convert the logarithm into exponential form:
step4: Evaluate the power:
step5: Expand the expression:
step6: Move the expression to the left side:
step7: Factor the expression:
step8: Separate into possible cases:
step9: Solve the equation:
step10: Check if the solution is in the defined range:
step11: Find the intersection:
The solution to the equation is .
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To solve the equation , we can combine the logarithmic terms using the property . This gives us:
Next, we can rewrite the equation in exponential form:
Rearranging this into standard quadratic form results in:
Now we can factor this quadratic:
Setting each factor to zero gives us the solutions and . Since must be positive for the logarithm to be defined, the only valid solution is .
Thus, the solution to the equation is:
Historical Background: Logarithms were introduced in the early 17th century by mathematician John Napier as a way to simplify calculations, particularly multiplication and division, into addition and subtraction. Used extensively in navigation and astronomy, these tiny numbers have made a big impact on our scientific advancements!
Real-World Application: Logarithms are not just for classrooms! They are widely used in fields like finance for calculating compound interest, in earthquake measurement (Richter scale), and in computer science, especially in algorithms like quicksort or binary search. So, the next time you multiply, think about how logarithms could simplify your life!