Solving for an inequality

May 2010
1
0
Hi,

I have a question which I've been trying to solve for a couple of hours now. Any help would be grateful appreciated:

Please help me solve this inequality:

cos 3x ≤ 1.2x - 1.9

with x in radians. Write your answer using interval notation, with values rounded to decimal places.

How do I do this???
Thank you
 

skeeter

MHF Helper
Jun 2008
16,216
6,764
North Texas
Hi,

I have a question which I've been trying to solve for a couple of hours now. Any help would be grateful appreciated:

Please help me solve this inequality:

cos 3x ≤ 1.2x - 1.9

with x in radians. Write your answer using interval notation, with values rounded to decimal places.

How do I do this???
by using technology, because you're not going to be able to do it by hand using elementary algebraic methods.

intervals where \(\displaystyle \cos(3x) \le 1.2x-1.9\) are \(\displaystyle [0.8678,1.5624]\) and \(\displaystyle [2.2846,\infty)\)
 
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