-(-у+2)²+у(у+3) =-(2-у)²+у(у+3)=-(4-4у+у²)+у²+3у=
=-4+4у-у²+у²+3у=7у-4
При у=2/7 : 7*(2/7)-4=2-4=-2
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-(-у+2)²+у(у+3) =-(2-у)²+у(у+3)=-(4-4у+у²)+у²+3у=
=-4+4у-у²+у²+3у=7у-4
При у=2/7 : 7*(2/7)-4=2-4=-2