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hawkfalcon

  • 3 years ago

What is x in this equation?

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  1. hawkfalcon
    • 3 years ago
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    \[\cos^2x +3cosx+2 = 0\]

  2. Mimi_x3
    • 3 years ago
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    u = cosx

  3. hawkfalcon
    • 3 years ago
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    Oh then its just a quadratic :O

  4. hawkfalcon
    • 3 years ago
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    :P What happens to the cos though? Do it after?

  5. Mimi_x3
    • 3 years ago
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    u^2 + 3u + 2 = 0 solve for u then later sub it back in btw is it only me that latex is not working?

  6. hawkfalcon
    • 3 years ago
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    Okay, thank you. I think its just you:O

  7. Mimi_x3
    • 3 years ago
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    np

  8. hawkfalcon
    • 3 years ago
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    I can't believe I didn't see it was just a simple quadratic *.*

  9. Mimi_x3
    • 3 years ago
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    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.

  10. hawkfalcon
    • 3 years ago
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    Alright! Thank you so much:D

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