How do you determine whether the function #f(x) = abs(x-3)# satisfies the hypotheses of the mean value theorem on the indicated interval (a,b), and if so how do you find all numbers c on [0,4] ?
The Mean Value Theorem has two hypotheses:
So, for the derivative, we have:
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To determine if the function ( f(x) = |x - 3| ) satisfies the hypotheses of the Mean Value Theorem on the interval ([0, 4]), we need to check if it meets two conditions:
- Continuity on the closed interval ([0, 4]).
- Differentiability on the open interval ((0, 4)).
Since ( |x - 3| ) is continuous and differentiable everywhere except at ( x = 3 ), it satisfies the first condition. To verify the second condition, we need to ensure that ( f'(x) ) exists for all ( x ) in ((0, 4)), except possibly at ( x = 3 ).
To find all numbers ( c ) on ([0, 4]) that satisfy the Mean Value Theorem, we need to find where the derivative of ( f(x) ) equals the average rate of change of ( f(x) ) over the interval ([0, 4]).
- Calculate the average rate of change of ( f(x) ) over ([0, 4]):
[ \frac{f(4) - f(0)}{4 - 0} = \frac{|4 - 3| - |0 - 3|}{4} = \frac{1 - 3}{4} = -\frac{1}{4} ]
- Find ( f'(x) ):
[ f'(x) = \frac{x - 3}{|x - 3|} ]
- Set ( f'(c) = -\frac{1}{4} ) and solve for ( c ):
[ \frac{c - 3}{|c - 3|} = -\frac{1}{4} ]
This equation holds true for ( c ) such that ( 0 < c < 3 ) and ( 3 < c < 4 ).
So, the numbers ( c ) satisfying the Mean Value Theorem on ([0, 4]) are in the intervals ( (0, 3) ) and ( (3, 4) ).
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
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