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Solve the equation and choose the **BEST** answer: \(\frac{\mathrm{9} }{\mathrm{b}} = \frac{\mathrm{b} }{\mathrm{4}}\)

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Question:

A
6

explanation

Cross-multiply: \(9 \times 4 = b \times b\)

\(36=b^2\)

Then, find the square root of both sides:

The actual square root of \(b^2\) is \(\pm b\) and the actual square root of 36 is \(\pm b\), so:

\(b= \pm 6\)

Of the answer choices for this question, 6 is the best choice since it is the only one that is true about the equation.

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