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ksaimouli

  • 5 years ago

3cosx+9=7 slove for x

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  1. myininaya
    • 5 years ago
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    Subtract 9 on both sides Then divide both sides by 3

  2. ksaimouli
    • 5 years ago
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    yes i got 131.8 another on ew

  3. ksaimouli
    • 5 years ago
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    plz say plz

  4. myininaya
    • 5 years ago
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    \[\cos(x)=\frac{-2}{3}\] \[\cos(x)=\cos(x+2 \pi n)\] \[\text{ so we have } \cos(x+2 n \pi)=\frac{-2}{3}\]

  5. myininaya
    • 5 years ago
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    Now take arccos of both sides

  6. myininaya
    • 5 years ago
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    \[x+2 n \pi=arc \cos(-\frac{2}{3})\]

  7. myininaya
    • 5 years ago
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    to solve for x subtract 2npi on both sides

  8. karatechopper
    • 5 years ago
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    @myin on this..i have to learn this for ACT, but how would u solve it exactly? what does cos mean?

  9. myininaya
    • 5 years ago
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    |dw:1326937963668:dw|

  10. karatechopper
    • 5 years ago
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    ok.

  11. karatechopper
    • 5 years ago
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    and sin?

  12. myininaya
    • 5 years ago
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    opp/hyp

  13. karatechopper
    • 5 years ago
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    opp stands for..........?

  14. myininaya
    • 5 years ago
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    opposite

  15. karatechopper
    • 5 years ago
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    so opposite of hypotenuse?

  16. myininaya
    • 5 years ago
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    / means divided by

  17. anonymous
    • 5 years ago
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    cos(x) = -2/3 Find the inverse of the cosine, make sure calculator is in degree mode. x = cos^-1(-2/3)

  18. myininaya
    • 5 years ago
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    great that's one solution

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