9-(2s-1)²=
=9-(4s²-4s+1)=
=9-4s²+4s-1=
=-4s²+4s+8=
=4(-s²+s+2)=
=4(s+1)(2-s)
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9-(2s-1)²=
=9-(4s²-4s+1)=
=9-4s²+4s-1=
=-4s²+4s+8=
=4(-s²+s+2)=
=4(s+1)(2-s)