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anonymous

  • one year ago

can a anyone explain how to do this problems? Find all solutions to the equation. 7 sin2x - 14 sin x + 2 = -5

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  1. Nnesha
    • one year ago
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    set it equal to 0

  2. Nnesha
    • one year ago
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    let sinx= x write it as quadratic equation \[\huge\rm 7x^2 -14x +2 +5 =0\]

  3. anonymous
    • one year ago
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    7sin2x - 14sinx + 2 = -5 7sin2x - 14sinx = -7 7(sin2x - 2sinx) = -7 sin2x - 2sinx = -1 2sinxcosx - 2sinx = -1 2sinx (cosx - 1) = -1 Now solve 2sinx = -1 cosx - 1 ==1

  4. alekos
    • one year ago
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    Are we looking at \[\sin ^{2}x\] or sin2x

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