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Simplifying 6cos2 + -5cosx + -21 = 0 Reorder the terms: -21 + -5cosx + 6cos2 = 0 Solving -21 + -5cosx + 6cos2 = 0 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '21' to each side of the equation. -21 + -5cosx + 21 + 6cos2 = 0 + 21 Reorder the terms: -21 + 21 + -5cosx + 6cos2 = 0 + 21 Combine like terms: -21 + 21 = 0 0 + -5cosx + 6cos2 = 0 + 21 -5cosx + 6cos2 = 0 + 21 Combine like terms: 0 + 21 = 21 -5cosx + 6cos2 = 21 Reorder the terms: -21 + -5cosx + 6cos2 = 21 + -21 Combine like terms: 21 + -21 = 0 -21 + -5cosx + 6cos2 = 0 The solution to this equation could not be determined.
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