Welcome to TutorTeddy.com

A dump of our free Chat sessions, in case it is useful. It excludes white boards used during paid sessions.

student : solve for all solutions on [0,2pi) cos^2x+4cosx+3=0
tutorsd6 : let cosx = y , then we get y^2 - 4y + 3 = 0
tutorsd6 : y^2 - 3y - y + 3 = 0
tutorsd6 : y ( y - 3 ) - 1 ( y - 3 ) = 0
tutorsd6 : ( y - 3 ) ( y - 1 ) = 0
tutorsd6 : ( cosx - 1 ) ( cosx - 3 ) = 0
tutorsd6 : cosx = 1 or cosx = cos 0
tutorsd6 : x = 0
tutorsd6 : cosx can not be value = 3
tutorsd6 : cosx = + 1 or + 3
student : why isn't it +1 and +3. I don't see how you went from +4cosx to -4cosx (-4y) in the example
tutorsd6 : the range of cosx is - 1 to + 1
tutorsd6 : i took cosx = y , then substitute as cosx = y
tutorsd6 : understand ?
tutorsd6 : yes , you are correct
tutorsd6 : Please note, due to lack of resources, we can only do 1 problem FREE in 24 hours period. You can always come back tomorrow for another free problem. Please, tell your friends about our free service - 1 free in 24 hours
tutorsd6 : Get 1 homework problem done for 99 cents only.
tutorsd6 : Improve your grades, get 1 hour of Math coaching only \$16..
tutorsd6 : Fax your homework to 206-339-8302. or, email to *****@aafter.com. Include your email and phone number.
tutorsd6 : nullstring

TutorTeddy.com & Boston Predictive Analytics

[ Email your Statistics or Math problems to tutor@aafter.com (camera phone photos are OK) ]

Boston Office (Near MIT/Kendall 'T'):
Cambridge Innovation Center,