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Simplifying x2 + 4x + 72 = 0 Reorder the terms: 72 + 4x + x2 = 0 Solving 72 + 4x + x2 = 0 Solving for variable 'x'. Begin completing the square. Move the constant term to the right: Add '-72' to each side of the equation. 72 + 4x + -72 + x2 = 0 + -72 Reorder the terms: 72 + -72 + 4x + x2 = 0 + -72 Combine like terms: 72 + -72 = 0 0 + 4x + x2 = 0 + -72 4x + x2 = 0 + -72 Combine like terms: 0 + -72 = -72 4x + x2 = -72 The x term is 4x. Take half its coefficient (2). Square it (4) and add it to both sides. Add '4' to each side of the equation. 4x + 4 + x2 = -72 + 4 Reorder the terms: 4 + 4x + x2 = -72 + 4 Combine like terms: -72 + 4 = -68 4 + 4x + x2 = -68 Factor a perfect square on the left side: (x + 2)(x + 2) = -68 Can't calculate square root of the right side. The solution to this equation could not be determined.
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