What is the extreme f(x)=2x^3-6x^2-18x+7 ?

The extreme f(x)=2x^3-6x^2-18x+7 is Maximum(-1,17),Minimum(3,-47)

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extreme f(x)=2x^3-6x^2-18x+7

extreme points

f (x) = 2 x^{3} - 6 x^{2} - 18 x + 7

Maximum (- 1, 17), Minimum (3, - 47)

Solution steps

f^{'} (x) = 6 x^{2} - 12 x - 18

Find intervals:

Increasing

: - \infty < x < - 1,

Decreasing

: - 1 < x < 3,

Increasing

: 3 < x < \infty

Plug

x = - 1

into

2 x^{3} - 6 x^{2} - 18 x + 7 : 17

Maximum (- 1, 17)

Plug

x = 3

into

2 x^{3} - 6 x^{2} - 18 x + 7 : - 47

Minimum (3, - 47)

Maximum (- 1, 17), Minimum (3, - 47)

f (x, y) = 2 x - y + 2

f (x) = 3 x^{4} - 4 x^{3} - 8

f (x, y) = - 250 - 2 x^{2} - 3 y^{2}

f (x) = x - ln (1 + x)

f (x, y) = - \frac{1}{x - y}

What is the extreme f(x)=2x^3-6x^2-18x+7 ?
The extreme f(x)=2x^3-6x^2-18x+7 is Maximum(-1,17),Minimum(3,-47)