Solve for x in the equation 3^x - 2^x = 65

Published on November 6, 2024

Algebra

The equation 3^x - 2^x = 65 has a solution at x = 4.

Question

Answer

The given equation is .
We can try integer values for to find a solution.
If , .
If , .
If , .
If , .
Thus, is a solution.
Let .
The derivative of is .
Since and are always positive, and , the derivative is positive when is large enough.
When , .
When , .
When , .
When , .
When , .
Since for , is an increasing function for .
Therefore, is the only solution.
Final Answer: The final answer is