Elementary Algebra Answer 5

Elementary Algebra Answer 5:

5. Which of the following equations is equal to Ö45?

A. 1 ÷ 45

B. 5Ö9

C. 9Ö5

D. 3Ö5

E. 5Ö3

The correct answer is D.

For elementary algebra problems like this one, you need to remember certain mathematical principles.

First, remember to factor the number inside the square root sign. The factors of 45 are:

1 ´ 45 = 45
3 ´ 15 = 45
5 ´ 9 = 45

Then look to see if any of these factors have square roots that are whole numbers.

In this case, the only factor whose square root is an whole number is 9. Now find the sqaure root of 9:

Ö9 = 3

Finally, you need to put this number at the front of the square root sign and put the other factor inside the square root sign:

3Ö5

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