平方完成です♪
y=-1/2(x*2-4x)
からあの式を連想せよ^_^
x*2-4x+4=(x-2)*2
より
y=-1/2(x*2-4x+4-4)=-1/2{(x-2)*2-4}
=-1/2(x-2)*2-1/2✖️(-4)
=-1/2(x-2)*2+2
ただし*は累乗の記号
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