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Solving equations with quadratic formula? 8n^2 + 4n - 16 = -n^2

8n2 + 4n - 16 = -n2

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Michael J. | Effective High School STEM Tutor & CUNY Math Peer LeaderEffective High School STEM Tutor & CUNY ...
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Add n2 to both sides of the equation.
 
9n2 + 4n - 16 = 0
 
 
Now you can use the quadratic formula.  Refer to your textbooks on how to use the formula and what it looks like.