SOLUTION: solve: z+9/z= -10

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Question 314259: solve:
z+9/z= -10
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
z+9/z= -10
(z*z+9)/z=-10
(z^2+9)/z=-10 cross multiply.
z^2+9=-10z
z^2+10z+9=0
(z+9)(z+1)=0
z+9=0
z=-9 ans.
z+1=0
z=-1 ans.