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Simplifying 2x2 + 15x + 56 = 0 Reorder the terms: 56 + 15x + 2x2 = 0 Solving 56 + 15x + 2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 2 the coefficient of the squared term: Divide each side by '2'. 28 + 7.5x + x2 = 0 Move the constant term to the right: Add '-28' to each side of the equation. 28 + 7.5x + -28 + x2 = 0 + -28 Reorder the terms: 28 + -28 + 7.5x + x2 = 0 + -28 Combine like terms: 28 + -28 = 0 0 + 7.5x + x2 = 0 + -28 7.5x + x2 = 0 + -28 Combine like terms: 0 + -28 = -28 7.5x + x2 = -28 The x term is 7.5x. Take half its coefficient (3.75). Square it (14.0625) and add it to both sides. Add '14.0625' to each side of the equation. 7.5x + 14.0625 + x2 = -28 + 14.0625 Reorder the terms: 14.0625 + 7.5x + x2 = -28 + 14.0625 Combine like terms: -28 + 14.0625 = -13.9375 14.0625 + 7.5x + x2 = -13.9375 Factor a perfect square on the left side: (x + 3.75)(x + 3.75) = -13.9375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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