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





tutorsd6 : Please, share your Math problem...
student : solve for all solutions on [0,2pi) cos^2x+4cosx+3=0
tutorsd6 : please wait
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
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tutorsd6 : nullstring
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