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Simplifying x2 + 2x + -9 = -15 Reorder the terms: -9 + 2x + x2 = -15 Solving -9 + 2x + x2 = -15 Solving for variable 'x'. Reorder the terms: -9 + 15 + 2x + x2 = -15 + 15 Combine like terms: -9 + 15 = 6 6 + 2x + x2 = -15 + 15 Combine like terms: -15 + 15 = 0 6 + 2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-6' to each side of the equation. 6 + 2x + -6 + x2 = 0 + -6 Reorder the terms: 6 + -6 + 2x + x2 = 0 + -6 Combine like terms: 6 + -6 = 0 0 + 2x + x2 = 0 + -6 2x + x2 = 0 + -6 Combine like terms: 0 + -6 = -6 2x + x2 = -6 The x term is 2x. Take half its coefficient (1). Square it (1) and add it to both sides. Add '1' to each side of the equation. 2x + 1 + x2 = -6 + 1 Reorder the terms: 1 + 2x + x2 = -6 + 1 Combine like terms: -6 + 1 = -5 1 + 2x + x2 = -5 Factor a perfect square on the left side: (x + 1)(x + 1) = -5 Can't calculate square root of the right side. The solution to this equation could not be determined.
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