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Simplifying x2 + 9x + k = 0 Reorder the terms: k + 9x + x2 = 0 Solving k + 9x + x2 = 0 Solving for variable 'k'. Move all terms containing k to the left, all other terms to the right. Add '-9x' to each side of the equation. k + 9x + -9x + x2 = 0 + -9x Combine like terms: 9x + -9x = 0 k + 0 + x2 = 0 + -9x k + x2 = 0 + -9x Remove the zero: k + x2 = -9x Add '-1x2' to each side of the equation. k + x2 + -1x2 = -9x + -1x2 Combine like terms: x2 + -1x2 = 0 k + 0 = -9x + -1x2 k = -9x + -1x2 Simplifying k = -9x + -1x2
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