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snivvles.com

  • one year ago

find solutions between 0 and 2pi 7 sin2x - 14 sin x + 2 = -5 will fan and medal

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  1. snivvles.com
    • one year ago
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    so far i've subtracted 2 from each side and divided by 7 to get sin^2x-2sinx=1

  2. snivvles.com
    • one year ago
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    @enchanted_bubbles @Peaches15

  3. Nnesha
    • one year ago
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    divided by 7 ?? why ?

  4. Nnesha
    • one year ago
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    this is like quadratic equation let sinx = x

  5. Nnesha
    • one year ago
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    \[\huge\rm 7x^2-14x+7=0\] now find GCF and then factor it let sinx = x

  6. snivvles.com
    • one year ago
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    to simplify the equation, because all three numbers where divisible by 7

  7. snivvles.com
    • one year ago
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    oh

  8. Nnesha
    • one year ago
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    ohh right you mean GCF

  9. snivvles.com
    • one year ago
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    i got x^2 -2x=0

  10. Purplemexican
    • one year ago
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    http://www.wolframalpha.com/input/?i=7+sin2x+-+14+sin+x+%2B+2+%3D+-5

  11. Nnesha
    • one year ago
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    correct so you will get \[\huge\rm \frac{ 7x^2 }{ 7}-\frac{ 14x }{ 7}+\frac{ 7 }{ 7 }=0\]

  12. Nnesha
    • one year ago
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    7/7 = ??

  13. snivvles.com
    • one year ago
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    1

  14. Nnesha
    • one year ago
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    yes right so it's x^2 -2x +1 =0

  15. snivvles.com
    • one year ago
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    OH right

  16. Nnesha
    • one year ago
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    after factor it ot 7(x^2-2x+1)=0 now set it equal to zero \[7\cancel{=}0 ~~~~x^2-2x+1=0\] now factor x^2-2x+1=0

  17. snivvles.com
    • one year ago
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    ok gimme a sec

  18. Nnesha
    • one year ago
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    :=)

  19. snivvles.com
    • one year ago
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    (x+2) (x-1)?

  20. Nnesha
    • one year ago
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    nope 2 times -1 = -2 but it suppose to be one find two number when you multiply them you should get 1 and when you add or subtract them you should get -2

  21. snivvles.com
    • one year ago
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    (x+2)(x-1)=0

  22. snivvles.com
    • one year ago
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    ok

  23. Nnesha
    • one year ago
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    easy method to factor quadratic equation find two number when you multiply them you should get product of AC and when you add or subtract them you should get middle term a=leading coefficient b=middle term c=constant term

  24. snivvles.com
    • one year ago
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    hang on a sec

  25. snivvles.com
    • one year ago
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    (x-1)^2

  26. snivvles.com
    • one year ago
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    ?

  27. Nnesha
    • one year ago
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    yep right -1 times -1 = 1 -1-1=-2

  28. Nnesha
    • one year ago
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    now change it back to sinx you get (sinx -1)^2=0 solve for sin x

  29. snivvles.com
    • one year ago
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    I need to find the answers in between (0,2pi)

  30. snivvles.com
    • one year ago
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    using the unit circle

  31. Nnesha
    • one year ago
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    yep so sinx -1= 0 solve for sinx sinx =1 right ? use unit circle to find radian where sinx = 1

  32. snivvles.com
    • one year ago
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    ok that's what i thought thank you so much!

  33. Nnesha
    • one year ago
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    my pleasure!

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