Question
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b.) \( 2^{2 x+1}+4^{x+1}=2^{2 x}\left(\frac{9}{2}\right) \)

Ask by Pope Chang. in South Africa
Jan 23,2025

Real Tutor Solution

Tutor-Verified Answer

Answer

There is no real solution to the equation \(2^{2x+1} + 4^{x+1} = 2^{2x} \left(\frac{9}{2}\right)\).

Solution

To solve the equation: \[ 2^{2x + 1} + 4^{x + 1} = 2^{2x} \left(\frac{9}{2}\right) \] Let's follow these steps: 1. **Express all terms with the same base:** Since \(4 = 2^2\), we can rewrite \(4^{x + 1}\) as: \[ 4^{x + 1} = (2^2)^{x + 1} = 2^{2(x + 1)} = 2^{2x + 2} \] So the equation becomes: \[ 2^{2x + 1} + 2^{2x + 2} = \frac{9}{2} \cdot 2^{2x} \] 2. **Factor out the common term \(2^{2x}\):** \[ 2^{2x} \cdot 2^1 + 2^{2x} \cdot 2^2 = \frac{9}{2} \cdot 2^{2x} \] \[ 2^{2x} (2 + 4) = \frac{9}{2} \cdot 2^{2x} \] \[ 2^{2x} \cdot 6 = \frac{9}{2} \cdot 2^{2x} \] 3. **Simplify the equation:** Since \(2^{2x} \neq 0\) for any real \(x\), we can divide both sides by \(2^{2x}\): \[ 6 = \frac{9}{2} \] 4. **Analyze the result:** The equation simplifies to \(6 = 4.5\), which is a **contradiction**. This means there's no real value of \(x\) that satisfies the original equation. **Conclusion:** There is **no real solution** to the given equation. **Final Answer:** No real solution exists for the equation; there is no value of x that satisfies it.

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Extra Insights

To solve the equation \( 2^{2x+1} + 4^{x+1} = 2^{2x} \left( \frac{9}{2} \right) \), we can start by rewriting \( 4^{x+1} \) as \( (2^2)^{x+1} = 2^{2(x+1)} = 2^{2x+2} \). Substituting this into the equation gives us: \[ 2^{2x+1} + 2^{2x + 2} = 2^{2x} \cdot \frac{9}{2}. \] Now, we can factor out \( 2^{2x} \) from the left-hand side: \[ 2^{2x} \left( 2 + 4 \right) = 2^{2x} \cdot \frac{9}{2}. \] This simplifies to: \[ 2^{2x} \cdot 6 = 2^{2x} \cdot \frac{9}{2}. \] Assuming \( 2^{2x} \neq 0 \), we can divide both sides by \( 2^{2x} \): \[ 6 = \frac{9}{2}. \] However, this is not true. This suggests that our assumption might lead us to a case where there are no solutions. To explore further, let’s check if \( 2^{2x} \) could be equal to zero, which is impossible, as the exponential function never equals zero. Thus there are no values of \( x \) that can satisfy the original equation. So, the equation has no solution.

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