ISEE Upper Level Quantitative : How to multiply exponents

Study concepts, example questions & explanations for ISEE Upper Level Quantitative

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Example Questions

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Example Question #1 : Exponents

Simplify: 

Possible Answers:

The correct answer is not among the other choices.

Correct answer:

Explanation:

Apply the power of a power property:

Example Question #2 : Exponents

Simplify the expression: 

Possible Answers:

Correct answer:

Explanation:

Apply the power of a product rule, then apply the power of a power rule:

Example Question #3 : Exponents

Which of the following expressions is equal to  ?

Possible Answers:

The expression is undefined.

Correct answer:

Explanation:

Any nonzero number raised to the power of 0 is equal to 1.

Example Question #1 : How To Multiply Exponents

Which quantity is greater?

(a) 

(b) 

Possible Answers:

(a) is greater.

(a) and (b) are equal.

(b) is greater.

It is impossible to tell from the information given.

Correct answer:

(b) is greater.

Explanation:

(a) 

(b) 

(b) is the greater quantity.

Example Question #5 : Exponents

 is positive.

Which is the greater quantity?

(a) 

(b) 

Possible Answers:

It is impossible to tell from the information given

(a) and (b) are equal

(b) is greater

(a) is greater

Correct answer:

(a) is greater

Explanation:

Use the power of a power property:

(a) 

(b) 

Since . Subsequently, 

,

making (a) greater

Example Question #2 : How To Multiply Exponents

Which is the greater quantity?

(a) 

(b) 

Possible Answers:

It is impossible to tell from the information given

(b) is greater

(a) is greater

(a) and (b) are equal

Correct answer:

(a) and (b) are equal

Explanation:

The two quantities are equal. 

Example Question #7 : Exponents

Two quantities are given - one in Column A and the other in Column B. Compare the quantities in the two columns.

Assume, in both columns, that .

Column A                    Column B

                          

Possible Answers:

The quantities in both columns are equal.

The quantity in Column B is greater.

The quantity in Column A is greater.

There is no way to determine the relationship between the columns.

Correct answer:

There is no way to determine the relationship between the columns.

Explanation:

Column A gives simplifies to give us , and Column B simplifies to give us . At first glance, Column B is greater, as it would be for all answers greater than 1. However, if , the two columns are equal. Furthermore, if  is negative, or a fraction, Column A is greater. Thus, since we could arrive at all three answers by using different numbers, we cannot determine the answer conclusively.

Example Question #8 : Exponents

Which of the following expressions is equivalent to 

 ?

Possible Answers:

Correct answer:

Explanation:

Use the difference of squares pattern as follows:

Example Question #3 : How To Multiply Exponents

Column A                  Column B

                  

Possible Answers:

The quantities in both columns are equal.

No relationship between the columns can be determined.

The quantity in Column A is greater.

The quantity in Column B is greater.

Correct answer:

The quantity in Column A is greater.

Explanation:

Anything raised to zero is equal to 1. Therefore, Column A has to be greater because 1 is greater than 0.

Example Question #10 : Exponents

44,000,000 can be written in scientific notation as  for some .

Which is the greater quantity?

(A) 

(B) 8

Possible Answers:

It is impossible to determine which is greater from the information given

(A) is greater

(A) and (B) are equal

(B) is greater

Correct answer:

(B) is greater

Explanation:

To write 44,000,000 in scientifc notation, write the implied decimal point after the final "0", then move it left until it is after the first nonzero digit (the first "4").

This requires a displacement of seven places, so  

, and (B) is greater.

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