hawkfalcon
  • hawkfalcon
What is x in this equation?
Mathematics
schrodinger
  • schrodinger
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hawkfalcon
  • hawkfalcon
\[\cos^2x +3cosx+2 = 0\]
Mimi_x3
  • Mimi_x3
u = cosx
hawkfalcon
  • hawkfalcon
Oh then its just a quadratic :O

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hawkfalcon
  • hawkfalcon
:P What happens to the cos though? Do it after?
Mimi_x3
  • Mimi_x3
u^2 + 3u + 2 = 0 solve for u then later sub it back in btw is it only me that latex is not working?
hawkfalcon
  • hawkfalcon
Okay, thank you. I think its just you:O
Mimi_x3
  • Mimi_x3
np
hawkfalcon
  • hawkfalcon
I can't believe I didn't see it was just a simple quadratic *.*
Mimi_x3
  • Mimi_x3
well using a substitution is easier; at times when you see like the x squared; there is a high chance that its a quadratic. so use a substitution.
hawkfalcon
  • hawkfalcon
Alright! Thank you so much:D

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