∴f′(x)=(2x+3)ex,
令f′(x)=(2x+3)ex>0,解得,x>−
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令f′(x)=(2x+3)ex<0,解得,x<−
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∴f(x)的单调递增区间为(−
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(2)令f'(x)=(2x+3)ex=0,得x=−
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x | (−∞,−
| −
| (−
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y' | 负 | 0 | 正 | ||||||
y | 递增 | 递减 |
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2 |
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故函数f(x)的极小值为−2e−
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x | (−∞,−
| −
| (−
| ||||||
y' | 负 | 0 | 正 | ||||||
y | 递增 | 递减 |
3 |
2 |
3 |
2 |
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2 |