Use the rational zero theorem, Descartes's rule of signs, and the theorem on bounds as aids in finding all real and imaginary roots to the equation.x4 + 18x3 + 71x2 - 18x - 72 = 0
A. -12, -6, -1, 1
B. -1, 1, 6, 12
C. -12, -6, 1, multiplicity 2
D. -6, -1, 1, 12
Answer: A
Mathematics
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? 
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