How do you verify whether rolle's theorem can be applied to the function #f(x)=absx# in [-1,1]?

Answer 1

According to Rolle's Theorem, there are three criteria for us to able to apply the theorem:

1.) #f(x)# must be continuous on #[a,b]#
2.) #f(x)# must be differentiable on #(a,b)#
3.) #f(a) = f(b)#

#f(x) = |x| -># is not differentiable at x=0 which is#in[-1, 1]#
#:.# We cannot apply Rolle's Theorem
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Answer 2

To verify whether Rolle's Theorem can be applied to the function ( f(x) = |x| ) in the interval ([-1, 1]), we need to check two conditions:

  1. Continuity: Verify if ( f(x) = |x| ) is continuous on the closed interval ([-1, 1]). Since ( |x| ) is continuous everywhere, including at ( x = -1 ) and ( x = 1 ), it is continuous on the interval ([-1, 1]).

  2. Differentiability: Check if ( f(x) = |x| ) is differentiable on the open interval ((-1, 1)). At ( x = 0 ), the derivative of ( f(x) = |x| ) does not exist since the function has a sharp corner at ( x = 0 ). However, for ( x \neq 0 ), the function is differentiable as it behaves like the function ( y = x ) or ( y = -x ). Thus, the function is differentiable on the open interval ((-1, 1) \setminus {0}).

Since both conditions are met (continuity on ([-1, 1]) and differentiability on ((-1, 1) \setminus {0})), Rolle's Theorem can be applied to the function ( f(x) = |x| ) in the interval ([-1, 1]).

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Answer from HIX Tutor

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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