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Simplifying 2cos2x + -9cosx + -7 = 0 Reorder the terms: -7 + -9cosx + 2cos2x = 0 Solving -7 + -9cosx + 2cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '7' to each side of the equation. -7 + -9cosx + 7 + 2cos2x = 0 + 7 Reorder the terms: -7 + 7 + -9cosx + 2cos2x = 0 + 7 Combine like terms: -7 + 7 = 0 0 + -9cosx + 2cos2x = 0 + 7 -9cosx + 2cos2x = 0 + 7 Combine like terms: 0 + 7 = 7 -9cosx + 2cos2x = 7 Reorder the terms: -7 + -9cosx + 2cos2x = 7 + -7 Combine like terms: 7 + -7 = 0 -7 + -9cosx + 2cos2x = 0 The solution to this equation could not be determined.
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