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tangent y=x^3-9x,(3,0)

解答

切线

y = x^{3} - 9 x, (3, 0)

解答

y = 18 x - 54

求解步骤

计算

y = x^{3} - 9 x

的斜率:

\frac{d y}{d x} = 3 x^{2} - 9

EN : T i tl e G e n er a l Eq u a t i o n Sl o p e A t P o in t 2 Eq : m = 18

找到斜率 m=

18

且穿过

(3, 0)

的直线:

y = 18 x - 54

y = 18 x - 54

作图

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