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Solve the Polynomial Equation in the Complex Numbers 3x3−x2−21x+7=03 x ^ { 3 } - x ^ { 2 } - 21 x + 7 = 0

Question 111

Multiple Choice

Solve the polynomial equation in the complex numbers.
- 3x3−x2−21x+7=03 x ^ { 3 } - x ^ { 2 } - 21 x + 7 = 0


A) {3,7,−7}\{ 3 , \sqrt { 7 } , - \sqrt { 7 } \}
B) {12,7,−7}\left\{ \frac { 1 } { 2 } , \sqrt { 7 } , - \sqrt { 7 } \right\}
C) {−12,7,−7}\left\{ - \frac { 1 } { 2 } , \sqrt { 7 } , - \sqrt { 7 } \right\}
D) {−3,7,−7}\{ - 3 , \sqrt { 7 } , - \sqrt { 7 } \}

Correct Answer:

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