Solve the equation f(x) = 0 analytically and then use the graph of y = f(x) to solve the inequalities f(x) < 0 and 
f(x) = 5 log3 (3x) - 20
A. {27}; (-?, 27); [27, ?)
B. {27}; (27, ?); [0, 27)
C. {81}; (0, 81); [81, ?)
D. {27}; (0, 27); [27, ?)
Answer: D
Mathematics
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