Question
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If \( 3^{-3 x+6}=27^{x+4} \), then \( x \) equals a.) -2 c.) 5 b.) 1 d.) 0.5

Ask by Ross Coles. in the United States
Mar 01,2025

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Tutor-Verified Answer

Answer

The correct value of \( x \) is –1, but none of the provided options match this value.

Solution

We start with the equation   3^(–3x + 6) = 27^(x + 4). Notice that 27 can be written as 3³, so we have:   3^(–3x + 6) = (3³)^(x + 4) = 3^(3(x + 4)) = 3^(3x + 12). Since the bases are the same, the exponents must be equal:   –3x + 6 = 3x + 12. Now, solve for x:   –3x – 3x = 12 – 6   –6x = 6,   x = –1. This shows that x = –1. However, the choices provided are:   a.) –2  b.) 1  c.) 5  d.) 0.5 Since –1 is not among the given options, there appears to be a discrepancy between the correct answer and the provided choices.

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The Deep Dive

To solve the equation \( 3^{-3x + 6} = 27^{x + 4} \), we can rewrite \( 27 \) as \( 3^3 \). This gives us: \[ 27^{x + 4} = (3^3)^{x + 4} = 3^{3(x + 4)} = 3^{3x + 12} \] Now, equate the exponents since the bases are the same: \[ -3x + 6 = 3x + 12 \] Now, let's solve for \( x \): \[ -3x - 3x = 12 - 6 \\ -6x = 6 \\ x = -1 \] The correct answer is not listed, let's check the calculations again: Combining terms yields \( -3x - 3x = -6x \). So, from the rearrangement, we had: \(-3x + 6 = 3x + 12\) Now moving everything involving \(x\) to one side and constant to the other: \(-3x - 3x = 12 - 6\) This simplifies correctly to \(-6x = 6\) where when divided gives: \(x = -1\) This confirms the previous calculation. Thus, no solution from the choices provided fits. Therefore, the choice of \(x\) is not among those given options.

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