if (x2+x)=5 then (x+3)2+1/(x+3)2=?
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x^2 + x = 5
=> (x+3)(x-2)=-1
=> 1/(x+3) = 2-x
1
now
=> (x+3)(x-2)=-1
=> 1/(x+3) = 2-x
1
now
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