SOLUTION: y^-2-3y^-1+4=0

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Question 320155: y^-2-3y^-1+4=0
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Use a substitution, let u=y%5E%28-1%29.
u%5E2=y%5E%28-2%29
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y%5E%28-2%29-3y%5E%28-1%29%2B4=0
u%5E2-3u%2B4=0
%28u-3%29%28u-1%29=0
Two solutions:
u-3=0
u=3
y%5E%28-1%29=3
highlight%28y=1%2F3%29
.
.
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u-1=0
u=1
y%5E%28-1%29=1
highlight%28y=1%29