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OpenStudy (anonymous):
2cos^2-3cos-2=0 find all possible solutions,, show work please!
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OpenStudy (anonymous):
Factor that expression. It is the same style/format as 2x^2 - 3x - 2 = 0
OpenStudy (anonymous):
ok I got cos =2 and -1/2... but they want exact values. I have the answers in the back of the book.. its 120+360 n or 240+360 n.. where n is any integer.. just not sure how to get there. thanks
OpenStudy (anonymous):
got it never mind! thank you
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