Question 23

Mathematics Basic Algebra Medium

If \( x, y \) are real numbers such that \( 2^{x+(\frac{1}{2})} \times 4^{y-(\frac{5}{6})} = 3^{x-(\frac{1}{2})} \times 9^{y-(\frac{1}{3})} \), then which of the following is true?

(A) \( 6x + 12y + 7 = 0 \)
(B) \( 6x - 12y + 7 = 0 \)
(C) \( 6x + 12y - 7 = 0 \)
(D) \( x - 12y - 7 = 0 \)
✓ Correct Answer: Option C Verified Solution

📘 Step-by-Step Solution & Detailed Explanation:

Rewrite the bases to express everything in terms of 2 and 3:\n\[ 2^{x + \frac{1}{2}} \times (2^2)^{y - \frac{5}{6}} = 3^{x - \frac{1}{2}} \times (3^2)^{y - \frac{1}{3}} \]\n\[ 2^{x + \frac{1}{2}} \times 2^{2y - \frac{5}{3}} = 3^{x - \frac{1}{2}} \times 3^{2y - \frac{2}{3}} \]\n\nCombine the exponents:\n\[ 2^{x + 2y + \frac{1}{2} - \frac{5}{3}} = 3^{x + 2y - \frac{1}{2} - \frac{2}{3}} \]\n\nSimplify the constant terms:\n\[ \frac{1}{2} - \frac{5}{3} = \frac{3 - 10}{6} = -\frac{7}{6} \]\n\[ -\frac{1}{2} - \frac{2}{3} = \frac{-3 - 4}{6} = -\frac{7}{6} \]\n\nSo the equation becomes:\n\[ 2^{x + 2y - \frac{7}{6}} = 3^{x + 2y - \frac{7}{6}} \]\n\nSince the bases (2 and 3) are different, the only way for their powers to be equal is if the exponent itself is zero:\n\[ x + 2y - \frac{7}{6} = 0 \]\n\nMultiply the entire equation by 6:\n\[ 6x + 12y - 7 = 0 \]

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