SOLUTION: 10cos^2x+9cosx+2=0 find all solution in the interval [0,360)?
the answer is 113.58,246.42,120,240
i needed step by step solution
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Question 1053554: 10cos^2x+9cosx+2=0 find all solution in the interval [0,360)?
the answer is 113.58,246.42,120,240
i needed step by step solution
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!
Use a substitution,
Now just solve it like a quadratic equation,
Factoring,
So then,
Use a calculator to solve for the two values.
and,
Again use a calculator or from your previous studies,
and
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