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I am trying to simplify this equation and it won't work using this method, although i can do it using another method, so this method should work too. Could someone please look at my working and tell me where im going wrong?

-t^-1=-2A-(1/2)+1

2A^-(1/2)=t^-1 +1

A^(-1/2)=(t^-1 +1)/2

A^(1/2)=2/(t^-1 +1)

A=(2/(t^-1 +1))^(1/2)

Surely this should work, but the answer which is correct and i can get using another method is A=(4t^2)/(1+t)^2

Thanks for your help

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# What am i doing wrong

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