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Solve for x: x2 + 8x = -1

Solve for x: x2 + 8x = -1
asked 231k views
5 votes
Solve for x:

x2 + 8x = -1

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User Fernando Ortega
by
7.8k points

1 Answer

1 vote

x^2+8x=-1\\ x^2+8x+16-16=-1\\ (x+4)^2=15\\ x+4=√(15) \vee x+4=-√(15)\\ x=-4+√(15) \vee x=-4-√(15)
answered
User Crmepham
by
7.9k points
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