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Algebra I problem, Please Help?
81) 9√10 ÷ 4+2√5
83) 2√5-7√2 ÷ 7√2-3√7
I've spent a good 2 hours on 81 problem, and I still have one more so please help :'(
hahaha really guys?, these are questions from a review section in a college algebra book, my teacher just chose all the questions that we "should" know
3 Answers
- 1 decade agoFavorite Answer
srsly how old are you? This is like stuff most people know when they're 12.
I'm not even going to help you, hope you fail the class.
- GuillermoLv 71 decade ago
81)
9*sqrt(10)*(4 - 2*sqrt(5))
---------------------------------------- =
(4 + 2*sqrt(5))*(4 - 2*sqrt(5))
36*sqrt(10) - 90*sqrt(2)
---------------------------------
16 - 20
45*sqrt(2) - 18*sqrt(10)
---------------------------------
2
83)
(2*sqrt(5) - 7*sqrt(2))*(7*sqrt(2) + 3*sqrt(7))
-------------------------------------------------------------- =
(7*sqrt(2) - 3*sqrt(7))*(7*sqrt(2) + 3*sqrt(7))
14*sqrt(10) + 6*sqrt(35) - 98 - 21*sqrt(14)
------------------------------------------------------------- =
98 - 21
6*sqrt(35) - 21*sqrt(14) + 14*sqrt(10) - 98
------------------------------------------------------------
77
