Could someone help me with square roots?

Question

I need help with these two problems, I'm not good with simplifying.

Simplify:

3*20 + 6*5

*8 . *6 . *7

BY THE WAY, (*) equals a square root sign since i can't use one on IE

Answer 1

3Sqrt(20) + 6Sqrt(5) = 3Sqrt(5*4) + 6Sqrt(5) = 6Sqrt(5) + 6Sqrt(5) = 12Sqrt(5)

The substituions used above are (perhaps obviously):

20 = (5*4)

Sqrt(5*4) = Sqrt(5)*Sqrt(4)

Sqrt(4) = 2

The 2nd expression makes no sense as it appears in my browser.

*8.*6.*7    What operation does the (.) represent?

Obviously, others  assumed  (.) represented multiplication.

Sqrt(8) = Sqrt(4*2) = 2Sqrt(2)

Sqrt(6) and Sqrt(7) do not simplify

Answer 2

Here it is:

3*20 + 6*5

First simplify 20.

6*5 + 6*5

Then add.

12*5

(Note: You can only add/subtract numbers if you have the same number inside the square roots.)

--------------------------------------...

*8 . *6 . *7

Simplify the number that can be simplified.

2*2 . *6 . *7

Final answer is 2*2 . *6 . *7

(Note: this is the simplest form.)

Hope this helps. =)

Answer 3

No.

Answer 4

3√20+6√5

3√4√5+6√5

3*2√5 +6√5

6√5 +6√5

12√5

*8 . *6 . *7

√4√2√3√2√7

2 *4√21

8√21

Answer 5

3 x *(4 x5) + 6*5 =

3x2 *5 + 6*5 =

6*5 + 6*5 =

12*5

*8 = 2*2

*6 =*6

*7 = *7