Math
posted by Brandi .
The following are the last two problems on my test review. I am trying to study for a test. This is not my homework. I am not expecting anyone to do my homework for me. I just need to get the answers to be able to study and if you can help, I would really really appreciate it!
1. solve the equation. (9n+1)squared=0
2. solve the equation by completing the square. xsquared+x+7=0

Math 
Reiny
(9n+1)^2 = 0
9n+1 = 0
9n = 1
n = 1/9
x^2 + x = 7
x^2 + x + 1/4 = 7 + 1/4
(x+1/2)^ = 27/4
x+1 = ± √27 /2
x = 1 ±3i√3/2
= (2 ± 3i√3)/2 
Math 
Brandi
Hi, thank you for your time Reiny and your info. I am so sorry but on the first one I accidentally put 0 where I should have put =9. In other words, the first equation should have said (9n+1)squared =9. Really sorry to have taken up your time with the wrong equation, but if you are able to help me out again, with the right one, I would appreciate it. Also, I am unfamiliar with the sign you use that looks like a check mark, could you please advise what the sign means? Thanks for your help!

Math 
Jai
(9n+1)squared = 9
We expand the term with the square:
(81n^2 + 18n + 1) = 9
81n^2 + 18n + 1  9 = 0
81n^2 + 18n  8 = 0
Factoring,
(9n + 4)(9n  2) = 0
n = 4/9 and n = 2/9
Note that there are two values of n.
The sign that looks like a check mark in #2 is a squareroot sign.
I'm not Reiny but I hope you can trust my answer.
Hope this helps :3 
Math 
Steve
The answer is good, but it might have been a lot simpler to solve it the way Reiny did:
(9n+1)^2 = 9
9n+1 = ±3
9n = ±31
9n = 4,2
n = 4/9,2/9 
Math 
hjhj
(81n^3+18n^262n+3)/(9n+1)
Respond to this Question
Similar Questions

help me please
today has been very hectic along with homework i found out about 3 tests that i have tommorrow. I have to study for all three of the tests. The first is biology, second, is business law, and third it in Algebra II, and for homework … 
science
I need some help with my science homework. Well it is not really my homework it is my study guide but the actual test is the same as the study guide almost. They just switch around the words and stuff around to mess with your mind. … 
Math
If Sally makes all scores of 100 on ten of her homework assignments and 80 on her first test and 85 on her second test and 86 on her third test and 95 on her project. What would Sally's grade be if homework is 10%, test 1=20% test … 
English
I have a few more doubts about a few sentences. Thank you. 1) He denied robbing (instead of stealing? 
7th Grade Math
I got a math test coming up on Friday, and i need help on reviewing what i have learned. There's many questions and problems in it. I did this test on the first day of summer school, and since it's been two weeks already, i should've … 
pipe fitter test certification
Please Help!...I am in need of a study guide for my pipefitters test, or an outline of what's on the test. Unfortunately I am not able to take the class available. PLEASE if you know of one or where one would be available. Any information … 
statistics
A professor is interested in determining whether assigning mandatory homework affects students’ grades. He is currently teaching two sections of the same class; in one class, he assigns mandatory homework problems, while in the second … 
algebra homework help
A student missed 8 problems on a Chemistry test and received a grade of 47%. If all the problems were of equal value, how many problems were on the test? 
algebra homework help
A student missed 3 problems on a Physics test and received a grade of 94%. If all the problems were of equal value, how many problems were on the test? 
algebra homework help
student missed 11 problems on a Chemistry test and received a grade of 65%. If all the problems were of equal value, how many problems were on the test?