Que: Evaluate: 16ˣ – 4ˣ – 9 = 0.

a. ln [( 5 + \(\sqrt{21}\)) / 2] / ln 8
b. ln [( 2 + \(\sqrt{33}\)) / 2] / ln 5
c. ln [( 1 + \(\sqrt{37}\)) / 2] / ln 4
d. ln [( 1 – \(\sqrt{37}\)) / 2] / ln 3
Answer: ln [( 1 + \(\sqrt{37}\)) / 2] / ln 4

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