precal

posted by .

Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.)
2 cos2 θ − cos θ − 1 = 0

  • precal -

    what's the problem. You know how to solve quadratics:

    Let x = cosθ

    2x^2 - x - 1 = 0
    (2x+1)(x-1) = 0

    x = -1/2 or 1
    So,
    cosθ = -1/2 or 1
    . . .

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. calculus

    Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) sin θ cos θ − 2 sin …
  2. precal

    Find all solutions of the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) 2 cos θ − 1 = 0
  3. precal

    Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) tan θ = 1
  4. precal

    Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) cos θ = 0.32
  5. precalculus

    Find all solutions of the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) tan^2 θ − 3 = 0
  6. calculus

    Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) tan θ = −square root of 3
  7. calculus

    Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) tan θ = −square root of 3 answer in radian and please use the k integer
  8. Pre-Cal

    Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to two decimal places where appropriate.) cos θ = −1/2 1).θ= Answer-->(2π/3)+2πn, 4π/3+2πn …
  9. Pre-Cal (Help Plz!)

    Solve the given equation. (Enter your answers as a comma-separated list. Let k be any integer. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) (tan^2θ-9)(2cosθ+1)=0 θ=__________________ …
  10. Pre-Cal

    An equation is given. (Enter your answers as a comma-separated list. Round terms to three decimal places where appropriate. If there is no solution, enter NO SOLUTION.) 2 cos 2θ − 1 = 0 a). Find all solutions of the equations …

More Similar Questions