Solve the equation .
- (2)
- (b)
Solve the equation .
- (b)
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Worked solution
1(2)(b)
1. Change the base of the logarithm on the right-hand side to $x$.
2. Use the power law of logarithms to combine the terms.
3. Equate the arguments and form a quadratic equation.
4. Solve the quadratic equation and reject any invalid solutions.
For logarithms to be defined, the base and , and the arguments and .
When , the base is negative, so is rejected.
When , and , so it is valid.
Answer
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