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Simplifying x2 + 6x + 81 = 0 Reorder the terms: 81 + 6x + x2 = 0 Solving 81 + 6x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-81' to each side of the equation. 81 + 6x + -81 + x2 = 0 + -81 Reorder the terms: 81 + -81 + 6x + x2 = 0 + -81 Combine like terms: 81 + -81 = 0 0 + 6x + x2 = 0 + -81 6x + x2 = 0 + -81 Combine like terms: 0 + -81 = -81 6x + x2 = -81 The x term is 6x. Take half its coefficient (3). Square it (9) and add it to both sides. Add '9' to each side of the equation. 6x + 9 + x2 = -81 + 9 Reorder the terms: 9 + 6x + x2 = -81 + 9 Combine like terms: -81 + 9 = -72 9 + 6x + x2 = -72 Factor a perfect square on the left side: (x + 3)(x + 3) = -72 Can't calculate square root of the right side. The solution to this equation could not be determined.
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