Mathematics
Senior High

赤線の所の計算方法を教えていただきたいです🙇🏻‍♀️

(5) 関数 y=x4-4x3-2x2+12x+4 について y' = 4x³-12x²-4x+12=4(x+1)(x − 1)(x-3) - y'=0 とすると x= −1, 1, 3

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