anonymous
  • anonymous
what is X when 2sin^2(X)+9cos(X)+3=0
Precalculus
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
have you subbed \(\sin^2 x x = 1-\cos^2 x\) into the eq to simplify it into a quadratic eq?
anonymous
  • anonymous
no i haven't but i'll try it out right now thanks :)
anonymous
  • anonymous
u r welcome. The solution should be trivial after the substitution. :)

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anonymous
  • anonymous
I tried it but i still don't get it..
anonymous
  • anonymous
subbing, you should get, \(2-2\cos^2 x + 9 \cos x +3=0\) which equals, \(-2\cos^2 x + 9 \cos x +5=0\) let u = cos x the equation becomes \(-2u^2 + 9 u +5=0\) which is a quadratic equation of u. You can use the general formula to solve for u.
anonymous
  • anonymous
thanks o much.. i really appreciate it
anonymous
  • anonymous
you're welcome :)

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