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Simplifying x2 + 3x + 72 = 0 Reorder the terms: 72 + 3x + x2 = 0 Solving 72 + 3x + 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 + 3x + -72 + x2 = 0 + -72 Reorder the terms: 72 + -72 + 3x + x2 = 0 + -72 Combine like terms: 72 + -72 = 0 0 + 3x + x2 = 0 + -72 3x + x2 = 0 + -72 Combine like terms: 0 + -72 = -72 3x + x2 = -72 The x term is 3x. Take half its coefficient (1.5). Square it (2.25) and add it to both sides. Add '2.25' to each side of the equation. 3x + 2.25 + x2 = -72 + 2.25 Reorder the terms: 2.25 + 3x + x2 = -72 + 2.25 Combine like terms: -72 + 2.25 = -69.75 2.25 + 3x + x2 = -69.75 Factor a perfect square on the left side: (x + 1.5)(x + 1.5) = -69.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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