[中學] 多項式

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推 AquaCute    : (1) g(x)為奇函數, 有g(0) = 0
推 AquaCute    : f(-1) = 0 -> g(1) = -3, g(-1) = -3
→ AquaCute    :                               = 3
→ AquaCute    : f(1) = 42 -> g(3) = 39, g(-3) = -39
→ AquaCute    : 把g(x)畫出來 (3)錯(4)對
→ AquaCute    : (2) g(x)的對稱中心在(0,0) f(x)的對稱中心在(2,3)
→ AquaCute    : (5)f(-3)=g(-1)+3, f(-5) = g(-3)+3
→ AquaCute    : f(-3)f(-5) = 6*(-36)<0
→ freePrester : y=g(x)是y=f(x)平移(2,-3)，所以y=f(x)中心(-2,3)