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Find all critical numbers?
Find all critical numbers of
f(x)=x^(8)e^(−7x)
Hint: f '(x)=(8x7−7x8)e^(−7x)
2 Answers
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- emquacauLv 49 years agoFavorite Answer
f '(x)=8x^7 * e^(−7x) -7x^8 * e^(−7x) = x^7 * e^(−7x) (8 - 7x)
f(x) = 0 when
x^7 = 0 x = 0
8-7x = 0
x = 8/7
Critical numbers: 0, 8/7
- Anonymous9 years ago
x=0, x =8/7: you really can't solve such a simple equation?
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