SOLUTION: a^-2-2a^-1+5=0 I have tried this problem several times and am stuck. I can tell you I put the negatives on the bottom and came up with a common demoninator but I still can not

Question 539739: a^-2-2a^-1+5=0
I have tried this problem several times and am stuck. I can tell you I put the negatives on the bottom and came up with a common demoninator but I still can not come up with the correct answer.

Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!

LCD = a^2
Multiply equation by LCD

Find the roots of the equation by quadratic formula

a= 5 ,b= -2 ,c= 1
b^2-4ac=
b^2-4ac= 4 - -20
b^2-4ac= -16
= 4i

x1= (-(-2)+4i)/10
x1=0.2+0.4i
x2=0.2-0.4i
m.ananth@hotmail.ca
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