We are asked to solve the equation $3^{x+2} - 6 \cdot 3^x + 5 \cdot 3^{x-2} = 0$ for $x$.

AlgebraExponentsEquationsExponential EquationsNo Solution
2025/4/17

1. Problem Description

We are asked to solve the equation 3x+263x+53x2=03^{x+2} - 6 \cdot 3^x + 5 \cdot 3^{x-2} = 0 for xx.

2. Solution Steps

First, we can rewrite the terms in the equation using the properties of exponents:
3x+2=3x32=93x3^{x+2} = 3^x \cdot 3^2 = 9 \cdot 3^x
3x2=3x32=193x3^{x-2} = 3^x \cdot 3^{-2} = \frac{1}{9} \cdot 3^x
Substituting these back into the equation, we get:
93x63x+5193x=09 \cdot 3^x - 6 \cdot 3^x + 5 \cdot \frac{1}{9} \cdot 3^x = 0
Now, let y=3xy = 3^x. Then the equation becomes:
9y6y+59y=09y - 6y + \frac{5}{9}y = 0
Combining the terms, we have:
3y+59y=03y + \frac{5}{9}y = 0
27y+5y9=0\frac{27y + 5y}{9} = 0
32y9=0\frac{32y}{9} = 0
32y=032y = 0
y=0y = 0
Since y=3xy = 3^x, we have 3x=03^x = 0.
However, 3x3^x is always positive for any real number xx, so 3x3^x can never be equal to 00. Therefore, there is no solution to the equation.

3. Final Answer

There is no solution.

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