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y=-x^2+4x-2 =-(x^2-4x)-2 =-(x-2)^2+2 対称軸x=2∈[1,4] x=4時,y取得最小値は:ymin=-(4-2)2+2=-2 画像:開口部の下,対称軸x=2,頂点A(2,2),B(2-√2,0),C(2+√2,0),それぞれなめらかにAB,ACを接続し、その結果、関数の画像.
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