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Simplifying x2 + 18x + 128 = 0 Reorder the terms: 128 + 18x + x2 = 0 Solving 128 + 18x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-128' to each side of the equation. 128 + 18x + -128 + x2 = 0 + -128 Reorder the terms: 128 + -128 + 18x + x2 = 0 + -128 Combine like terms: 128 + -128 = 0 0 + 18x + x2 = 0 + -128 18x + x2 = 0 + -128 Combine like terms: 0 + -128 = -128 18x + x2 = -128 The x term is 18x. Take half its coefficient (9). Square it (81) and add it to both sides. Add '81' to each side of the equation. 18x + 81 + x2 = -128 + 81 Reorder the terms: 81 + 18x + x2 = -128 + 81 Combine like terms: -128 + 81 = -47 81 + 18x + x2 = -47 Factor a perfect square on the left side: (x + 9)(x + 9) = -47 Can't calculate square root of the right side. The solution to this equation could not be determined.
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