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5 February, 20:09

Find all the solutions to the equation 7sin^2x - 14sinx+2=-5

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Answers (1)
  1. 5 February, 20:15
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    I will get you started.

    Let sin x = u

    Then 7sin^2x - 14sinx+2=-5 become

    7u^2 - 14u = - 5

    7u^2 - 14u + 5 = 0

    Steps:

    1. Solve for u.

    2. Back - substitute for u.

    3. Take the arcsin on both sides to find the angle (s).

    You finish.
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