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Math
Posted 6 months ago
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Find the critical points of the function f(x)=x33x+1f(x) = x^3 - 3x + 1.
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Answer from Sia
Posted 6 months ago
Solution by Steps
step 1
To find the critical points of the function f(x)=x33x+1 f(x) = x^3 - 3x + 1 , we need to find the values of x x where the first derivative f(x) f'(x) is equal to zero or undefined
step 2
First, we calculate the derivative of f(x) f(x) . The derivative of x3 x^3 is 3x2 3x^2 , the derivative of 3x -3x is 3 -3 , and the derivative of a constant is 0. So, f(x)=3x23 f'(x) = 3x^2 - 3
step 3
Set the derivative equal to zero to find critical points: 3x23=0 3x^2 - 3 = 0
step 4
Factor out the common factor of 3: 3(x21)=0 3(x^2 - 1) = 0
step 5
Set the factored expression equal to zero: x21=0 x^2 - 1 = 0
step 6
Solve the equation x21=0 x^2 - 1 = 0 by factoring it as (x1)(x+1)=0 (x - 1)(x + 1) = 0
step 7
Set each factor equal to zero: x1=0 x - 1 = 0 and x+1=0 x + 1 = 0
step 8
Solve for x x in each equation: x=1 x = 1 and x=1 x = -1
Answer
The critical points of the function f(x)=x33x+1 f(x) = x^3 - 3x + 1 are x=1 x = 1 and x=1 x = -1 .
Key Concept
Critical Points of a Function
Explanation
Critical points of a function occur where its derivative is zero or undefined. In this case, the critical points are found by setting the first derivative of the function equal to zero and solving for x x .

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