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Simplifying cos(2x) + 7cos(x) + 4 = 0 Remove parenthesis around (2x) cos * 2x + 7cos(x) + 4 = 0 Reorder the terms for easier multiplication: 2cos * x + 7cos(x) + 4 = 0 Multiply cos * x 2cosx + 7cos(x) + 4 = 0 Multiply cos * x 2cosx + 7cosx + 4 = 0 Reorder the terms: 4 + 2cosx + 7cosx = 0 Combine like terms: 2cosx + 7cosx = 9cosx 4 + 9cosx = 0 Solving 4 + 9cosx = 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 + -4 + 9cosx = 0 + -4 Combine like terms: 4 + -4 = 0 0 + 9cosx = 0 + -4 9cosx = 0 + -4 Combine like terms: 0 + -4 = -4 9cosx = -4 Divide each side by '9osx'. c = -0.4444444444o-1s-1x-1 Simplifying c = -0.4444444444o-1s-1x-1
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