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astro's Question
Math
Posted 7 months ago
Determine the absolute extrema of the function f(x)=x312x+1f(x) = x^3 - 12x + 1 on the interval [3,3][-3, 3].
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Answer from Sia
Posted 7 months ago
Solution by Steps
step 1
To find the critical points of the function f(x)=x312x+1f(x) = x^3 - 12x + 1, we first need to find its derivative
step 2
The derivative of f(x)f(x) is f(x)=3x212f'(x) = 3x^2 - 12
step 3
Set the derivative equal to zero to find the critical points: 3x212=03x^2 - 12 = 0
step 4
Solve for xx: 3(x24)=0    x24=0    (x2)(x+2)=0    x=±23(x^2 - 4) = 0 \implies x^2 - 4 = 0 \implies (x - 2)(x + 2) = 0 \implies x = \pm 2
step 5
The critical points are x=2x = 2 and x=2x = -2
step 6
To find the absolute maximum and minimum on the interval [3,3][-3, 3], evaluate f(x)f(x) at the critical points and the endpoints of the interval
step 7
Evaluate f(x)f(x) at x=3x = -3: f(3)=(3)312(3)+1=27+36+1=10f(-3) = (-3)^3 - 12(-3) + 1 = -27 + 36 + 1 = 10
step 8
Evaluate f(x)f(x) at x=3x = 3: f(3)=3312(3)+1=2736+1=8f(3) = 3^3 - 12(3) + 1 = 27 - 36 + 1 = -8
step 9
Evaluate f(x)f(x) at x=2x = -2: f(2)=(2)312(2)+1=8+24+1=17f(-2) = (-2)^3 - 12(-2) + 1 = -8 + 24 + 1 = 17
step 10
Evaluate f(x)f(x) at x=2x = 2: f(2)=2312(2)+1=824+1=15f(2) = 2^3 - 12(2) + 1 = 8 - 24 + 1 = -15
step 11
Compare the values: f(3)=10f(-3) = 10, f(3)=8f(3) = -8, f(2)=17f(-2) = 17, f(2)=15f(2) = -15
step 12
The absolute maximum value is 1717 at x=2x = -2, and the absolute minimum value is 15-15 at x=2x = 2
Answer
The absolute maximum value of f(x)f(x) on the interval [3,3][-3, 3] is 1717 at x=2x = -2, and the absolute minimum value is 15-15 at x=2x = 2.
Key Concept
Critical points and evaluating endpoints
Explanation
To find the absolute extrema of a function on a closed interval, evaluate the function at its critical points and at the endpoints of the interval. Compare these values to determine the maximum and minimum.

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