limit as x approaches 2 of 3x^2-4x+5

解答

x \to 2 lim (3 x^{2} - 4 x + 5)

9

求解步骤

x \to 2 lim (3 x^{2} - 4 x + 5)

代入值

x = 2

= 3 \cdot 2^{2} - 4 \cdot 2 + 5

化简

3 \cdot 2^{2} - 4 \cdot 2 + 5 : 9

= 9

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