Posted by Joy on Tuesday, January 13, 2009 at 11:23pm.
4. 3ã11 + 4ã11 Answer: 8ã11
7. 7ã2  2ã8 Answer: 1ã2 ??
8. ã48 + ã75 Answer: 9ã3
9.(3ã10) Answer: 19 + 6ã10
10. ã27/64 (Fractions) Answer 3ã3/8 ??
11. 10ã20  3ã80 Answer: 10ã5
12. ã6/49 Fractions) Answer: ã6/7 ??
13. 3ã2 * ã14 Answer:stays the same ??
14. ã6/50 Answer: 10ã3
15. ã30 * 2ã12 Answer: ã30 * 4ã3
If I got any of these wrong, can someone please tell me how to do them correctly?

8th Grade AlgebraRadicals:Answer Check  Reiny, Wednesday, January 14, 2009 at 9:04am
I will assume your ã means 'square root'
4. 3ã11 + 4ã11 Answer: 8ã11  I recall 3+4 used to be 7, not 8
7. 7ã2  2ã8 Answer: 1ã2 ??
 7√2  2(2√2) = 3√2
9.(3ã10) Answer: 19 + 6ã10  how did you get that ????
 3√10 stays that way
11. 10ã20  3ã80 Answer: 10ã5  NO
10(√4)(√5)  3(√16)(√5) = 20√5  12√5 = 8√5
13. 3ã2 * ã14 Answer:stays the same ??  no
 3√2 * √14 = 3√28 = 3(√4)(√7) = 6√7
14. ã6/50 Answer: 10ã3  not clear, is the 50 part of the square root ?
If so, then √(6/50) = √(3/25) = (√3)/5
If it is (√6)/50 then it stays that way
15. ã30 * 2ã12 Answer: ã30 * 4ã3  don't understand what you did
√30 * 2√12 = 2√360 = 2(√9)(√4)(√10) = 24√10