Solve the Equation by the Quadratic Formula $$x ^ { 2 } + 12 x + 21 = 0$$

question 77

Multiple Choice

Solve the equation by the quadratic formula.
- $$x ^ { 2 } + 12 x + 21 = 0$$

• A) \[6 \pm \sqrt { 21 }\]
• B) \[6 + \sqrt { 15 }\]
• C) \[- 12 + \sqrt { 21 }\]
• D) \[- 6 \pm \sqrt { 15 }\]

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