149k views
5 votes
Simplify. Show your work.

Simplify. Show your work.-example-1
User Keeno
by
7.9k points

2 Answers

3 votes

Answer:

5. 12√3

6. 46 - 14√5

User Daniel Szmulewicz
by
7.8k points
3 votes

Answer:

5. 12√3

6. 46 - 14√5

Explanation:

5.

We want to simplify these radicals. Look at the first term: -3√3. Well, since 3 is a prime number, we cannot square root any of the factors of 3 further, so this is already in its simplest form.

Look at the next term: 3√12. Remember that 12 = 3 * 4, and 4 = 2², so we can actually write 3√12 as 3 * √3 * √4 = 3 * √3 * 2 = 6√3.

Look at the final term: 3√27. Remember that 27 = 3 * 9 and 9 = 3², so we can write 3√27 as 3 * √3 * √9 = 3 * √3 * 3 = 9√3.

Our new expression is -3√3 + 6√3 + 9√3. We can now combine them because they're like terms: 12√3.

6.

Let's use FOIL to expand this. FOIL is first, outer, inner, and last.

-3 and -2 are the first terms, so multiply them: (-3) * (-2) = 6.

-3 and 2√5 are the outer terms, so multiply them: (-3) * (2√5) = -6√5.

4√5 and -2 are the inner terms, so multiply them: (4√5) * (-2) = -8√5.

4√5 and 2√5 are the last terms, so multiply them: (4√5) * (2√5) = 8 * √25 = 8 * 5 = 40.

Now, add all these up:

6 + (-6√5) + (-8√5) + 40 = 46 - 14√5.

User Calvin Liu
by
8.5k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories