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

解答

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

- 2

求解步骤

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

代入值

x = - \frac{1}{2}

= 2 (- \frac{1}{2})^{2} + 3 (- \frac{1}{2}) - 1

化简

2 (- \frac{1}{2})^{2} + 3 (- \frac{1}{2}) - 1 : - 2

= - 2

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