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Simplifying 2cos2x + -7cosx + -4 = 0 Reorder the terms: -4 + -7cosx + 2cos2x = 0 Solving -4 + -7cosx + 2cos2x = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '4' to each side of the equation. -4 + -7cosx + 4 + 2cos2x = 0 + 4 Reorder the terms: -4 + 4 + -7cosx + 2cos2x = 0 + 4 Combine like terms: -4 + 4 = 0 0 + -7cosx + 2cos2x = 0 + 4 -7cosx + 2cos2x = 0 + 4 Combine like terms: 0 + 4 = 4 -7cosx + 2cos2x = 4 Reorder the terms: -4 + -7cosx + 2cos2x = 4 + -4 Combine like terms: 4 + -4 = 0 -4 + -7cosx + 2cos2x = 0 The solution to this equation could not be determined.
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