Homework Help: 8th Grade Algebra-Radicals:Answer Check

Posted by Joy on Tuesday, January 13, 2009 at 11:23pm.

4. 3Бу11 + 4Бу11 Answer: 8Бу11
7. 7Бу2 - 2Бу8 Answer: 1Бу2 ??
8. Бу48 + Бу75 Answer: 9Бу3
9.(3Бу10) Answer: 19 + 6Бу10
10. Бу27/64 (Fractions) Answer 3Бу3/8 ??
11. 10Бу20 - 3Бу80 Answer: 10Бу5
12. Бу6/49 Fractions) Answer: Бу6/7 ??
13. 3Бу2 * Бу14 Answer:stays the same ??
14. Бу6/50 Answer: 10Бу3
15. Бу30 * 2Бу12 Answer: Бу30 * 4Бу3

If I got any of these wrong, can someone please tell me how to do them correctly?

8th Grade Algebra-Radicals:Answer Check - Reiny, Wednesday, January 14, 2009 at 9:04am
I will assume your у means 'square root'

4. 3Бу11 + 4Бу11 Answer: 8Бу11 --- I recall 3+4 used to be 7, not 8

7. 7Бу2 - 2Бу8 Answer: 1Бу2 ??

---- 7√2 - 2(2√2) = 3√2

9.(3Бу10) Answer: 19 + 6Бу10 --- how did you get that ????
---- 3√10 stays that way

11. 10Бу20 - 3Бу80 Answer: 10Бу5 --- NO

10(√4)(√5) - 3(√16)(√5) = 20√5 - 12√5 = 8√5

13. 3Бу2 * Бу14 Answer:stays the same ?? --- no

----- 3√2 * √14 = 3√28 = 3(√4)(√7) = 6√7

14. Бу6/50 Answer: 10Бу3 --- 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. Бу30 * 2Бу12 Answer: Бу30 * 4Бу3 -- don't understand what you did

√30 * 2√12 = 2√360 = 2(√9)(√4)(√10) = 24√10

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