Can someone check my answers?

1. Simplify the sum or difference.

sqrt 5 + 6 sqrt 5

A) 6 sqrt 5

B) 30

C) 6 sqrt 10

D) 7 sqrt 5

2. Simplify the sum or difference.

4 sqrt 2 - 7 sqrt 2

A) negative sqrt 6

B) - 3 sqrt 2

C) - 11 sqrt 2

D) 11 sqrt 2

3. Simplify the sum or difference.

3 sqrt 7 - sqrt 63

A) - 2 sqrt 7

B) - 6 sqrt 7

C) - 4 sqrt 3

D) 0

4. Simplify the sum or difference.

-6 sqrt 10 + 5 sqrt 90

A) 9 sqrt 10

B) - 9 sqrt 10

C) - 39 sqrt 10

D) - 10

5. Simplify the product.

sqrt 6 (sqrt 2 + sqrt 3)

A) sqrt 8 + 3

B) sqrt 30

C) 2 sqrt 3 + 3 sqrt 2

D) 4 sqrt 2 + 3

Question

Hopkins

Mathematics

6 August, 13:55

Can someone check my answers?

1. Simplify the sum or difference.

sqrt 5 + 6 sqrt 5

A) 6 sqrt 5

B) 30

C) 6 sqrt 10

D) 7 sqrt 5

2. Simplify the sum or difference.

4 sqrt 2 - 7 sqrt 2

A) negative sqrt 6

B) - 3 sqrt 2

C) - 11 sqrt 2

D) 11 sqrt 2

3. Simplify the sum or difference.

3 sqrt 7 - sqrt 63

A) - 2 sqrt 7

B) - 6 sqrt 7

C) - 4 sqrt 3

D) 0

4. Simplify the sum or difference.

-6 sqrt 10 + 5 sqrt 90

A) 9 sqrt 10

B) - 9 sqrt 10

C) - 39 sqrt 10

D) - 10

5. Simplify the product.

sqrt 6 (sqrt 2 + sqrt 3)

A) sqrt 8 + 3

B) sqrt 30

C) 2 sqrt 3 + 3 sqrt 2

D) 4 sqrt 2 + 3

+2

Answers (1)

Know the Answer?

Amir Lowe · Answer 1

1. sqrt5 + 6sqrt5 = (1+6) sqrt5 = 7sqrt5 (answer is D)

2. 4sqrt2 - 7sqrt2 = (4-7) sqrt5 = - 3sqrt2 (answer is B)

3. 3sqrt7 - sqrt63 = 3sqrt7 - sqrt7 * sqrt9 = 3sqrt7 - 3sqrt7 = 0 (answer is D)

4. - 6sqrt10 + 5sqrt90 = - 6sqrt10 + 5 * (sqrt10 * sqrt9) = - 6sqrt10 + 5 * (3sqrt10)

= - 6sqrt10 + 15sqrt10 = 9sqrt10 (answer is A)

5. sqrt6 * (sqrt 2 + sqrt 3) = sqrt12 + sqrt18 = 2sqrt3 + 3sqrt2 (answer is D)