159k views
4 votes
Question:Which of the following is a solution of x2 + 8x = −32?

Answers:
 x = 8 − 8i

 
x = −8 + 8i  
x = 4 + 4i
 x = −4 + 4 i

1 Answer

4 votes

x^2 + 8x = -32\\ x^2+8x+16=-16\\ (x+4)^2=-16\\ x+4 =-√(-16) \vee x+4=√(-16)\\ x=-4-4i \vee x=-4+4i

So it's the last one.
User Oleg Popov
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