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Simplifying x2 + 4x + k = 0 Reorder the terms: k + 4x + x2 = 0 Solving k + 4x + x2 = 0 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-4x' to each side of the equation. k + 4x + -4x + x2 = 0 + -4x Combine like terms: 4x + -4x = 0 k + 0 + x2 = 0 + -4x k + x2 = 0 + -4x Remove the zero: k + x2 = -4x Add '-1x2' to each side of the equation. k + x2 + -1x2 = -4x + -1x2 Combine like terms: x2 + -1x2 = 0 k + 0 = -4x + -1x2 k = -4x + -1x2 Simplifying k = -4x + -1x2
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