limit as x approaches 2 of 3x^2+8x-1

解答

x \to 2 lim (3 x^{2} + 8 x - 1)

27

求解步骤

x \to 2 lim (3 x^{2} + 8 x - 1)

代入值

x = 2

= 3 \cdot 2^{2} + 8 \cdot 2 - 1

化简

3 \cdot 2^{2} + 8 \cdot 2 - 1 : 27

= 27

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