The line should read:
G 1 ( s ) = 5 s 2 + 2 s + 5 = 5 ( s + 1 ) 2 + 4 {\displaystyle G_{1}(s)={\frac {5}{s^{2}+2s+5}}={\frac {5}{\left(s+1\right)^{2}+4}}}
Return to errata.
