Calculus AB : Limits and Continuity

Study concepts, example questions & explanations for Calculus AB

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Example Questions

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Example Question #7 :Apply Intermediate Value Theorem

Can Intermediate Value Theorem be applied to the functionwithin the interval?

Possible Answers:

Yes, because the functionhas a root at

No, because

No, because the function is not continuous

Yes, because the function crosses theaxis within the interval

Correct answer:

No, because

Explanation:

The required conditions for Intermediate Value Theorem include the function must be continuous andcannot equal. While there is a root atfor this particular continuous function, this cannot be shown using Intermediate Value Theorem. The function does not cross theaxis, thus eliminating that particular answer choice. The correct answer is “No, because.” Since one of the conditions for Intermediate Value Theorem is thatcannot equal, by graphingwe can see that this requirement is not met.

Example Question #8 :Apply Intermediate Value Theorem

What can be concluded by using Intermediate Value Theorem for the functionon the interval?

Possible Answers:

There is a root for this polynomial located betweenand

The requirements for Intermediate Value Theorem are not met

There is a root for this polynomial at

There are two roots on this polynomial located betweenand

Correct answer:

There is a root for this polynomial located betweenand

Explanation:

his function is continuous (as it is a polynomial) and; therefore, the required conditions for Intermediate Value Theorem are met. While there is a root at这个函数(通过图形可以看出polynomial), Intermediate Value Theorem does not state where this root will be exactly, nor does it state how many roots there might be. Thus, the conclusion that can be made by IVT is that there is a root for this polynomial located somewhere betweenand.

Example Question #9 :Apply Intermediate Value Theorem

Let. Is there a numberbetweenandsuch that?

Possible Answers:

Yes, as shown by Intermediate Value Theorem

No, Intermediate Value Theorem cannot determine the exact value of

Yes, as shown by the Fundamental Theorem of Calculus

No, no number c such thatexists

Correct answer:

Yes, as shown by Intermediate Value Theorem

Explanation:

First, determine the values of the function at the bounds. This will allow the correct implementation of the Intermediate Value Theorem.

Because the problem asks to analyze the intervaland, there must be a value, with. Because, by Intermediate Value Theorem there should be a numberbetweenandthat satisfies the required conditions. Therefore, “Yes, as shown by Intermediate Value Theorem” is the correct answer.

Example Question #10 :Apply Intermediate Value Theorem

Assumeis continuous on the intervaland has the values listed in the table below. Which of the following values ofguarantees thathas at least two roots?

Q10 table

Possible Answers:

Correct answer:

Explanation:

If, only one root can be guaranteed (at).

If, then Intermediate Value Theorem can be applied twice, forand.

This is true because for continuous functions, Intermediate Value Theorem states that a change in sign (ex: from positive to negative) of the function within an interval suggests a root (where the function crosses theaxis) at some point within that interval.

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