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5. 함수 \( f(x)=\int\left(x^{2}+2 x\right) d x \) 일 때, \( \lim _{h \rightarrow 0} \frac{f(2+h)-f(2-h)}{h} \) 의 값은?

Ask by Owen Bowman. in South Korea
Mar 11,2025

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극한의 값은 16입니다.

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Beyond the Answer

주어진 함수 \( f(x) = \int (x^2 + 2x) \, dx \)의 불확정적적분을 계산하면, \( f(x) = \frac{x^3}{3} + x^2 + C \)가 됩니다. 이제 \( f(2+h) \)와 \( f(2-h) \)를 계산해보면: - \( f(2+h) = \frac{(2+h)^3}{3} + (2+h)^2 + C \) - \( f(2-h) = \frac{(2-h)^3}{3} + (2-h)^2 + C \) 한편, 차분을 구하면: \[ f(2+h) - f(2-h) = \left(\frac{(2+h)^3 - (2-h)^3}{3}\right) + (2+h)^2 - (2-h)^2 \] 여기서 \( (2+h)^2 - (2-h)^2 = 4h \)이고, \( (2+h)^3 - (2-h)^3 \)를 전개하고 단순화하면 \( 12h \)가 됩니다. 이제 전부 합치면: \[ = \frac{12h}{3} + 4h = 4h + 4h = 8h \] 그러므로, \[ \frac{f(2+h) - f(2-h)}{h} = 8 \] 따라서 극한을 취하면: \[ \lim_{h \rightarrow 0} \frac{f(2+h) - f(2-h)}{h} = 8 \] 결과적으로, 주어진 값은 \( 8 \)입니다.

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