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Popular Functions >

extreme f(x)=x(x-3)^2(x+1)

Solution

extreme points

f (x) = x (x - 3)^{2} (x + 1)

Solution

Minimum (\frac{3 - 57}{8}, \frac{3 ( 471 - 133 57 )}{512}), Maximum (\frac{3 + 57}{8}, \frac{3 ( 471 + 133 57 )}{512}), Minimum (3, 0)

Solution steps

f^{'} (x) = (x - 3) (4 x^{2} - 3 x - 3)

Find intervals:

Decreasing

: - \infty < x < \frac{3 - 57}{8},

Increasing

: \frac{3 - 57}{8} < x < \frac{3 + 57}{8},

Decreasing

: \frac{3 + 57}{8} < x < 3,

Increasing

: 3 < x < \infty

Plug

x = \frac{3 - 57}{8}

into

x (x - 3)^{2} (x + 1) : \frac{3 ( 471 - 133 57 )}{512}

Minimum (\frac{3 - 57}{8}, \frac{3 ( 471 - 133 57 )}{512})

Plug

x = \frac{3 + 57}{8}

into

x (x - 3)^{2} (x + 1) : \frac{3 ( 471 + 133 57 )}{512}

Maximum (\frac{3 + 57}{8}, \frac{3 ( 471 + 133 57 )}{512})

Plug

x = 3

into

x (x - 3)^{2} (x + 1) : 0

Minimum (3, 0)

Minimum (\frac{3 - 57}{8}, \frac{3 ( 471 - 133 57 )}{512}), Maximum (\frac{3 + 57}{8}, \frac{3 ( 471 + 133 57 )}{512}), Minimum (3, 0)

Graph

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Frequently Asked Questions (FAQ)

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