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6 Determine the Most Efficient Method to Use When Solving 7x2=12x37 x ^ { 2 } = - 12 x - 3

Question 252

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6 Determine the Most Efficient Method to Use When Solving a Quadratic Equation
- 7x2=12x37 x ^ { 2 } = - 12 x - 3


A) {6157,6+157}\left\{ \frac { - 6 - \sqrt { 15 } } { 7 } , \frac { - 6 + \sqrt { 15 } } { 7 } \right\}
B) {61514,6+1514}\left\{ \frac { - 6 - \sqrt { 15 } } { 14 } , \frac { - 6 + \sqrt { 15 } } { 14 } \right\}
C) {12157,12+157}\left\{ \frac { - 12 - \sqrt { 15 } } { 7 } , \frac { - 12 + \sqrt { 15 } } { 7 } \right\}
D) {6577,6+577}\left\{ \frac { - 6 - \sqrt { 57 } } { 7 } , \frac { - 6 + \sqrt { 57 } } { 7 } \right\}

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