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Simplifying x2 + 20 = -2x Reorder the terms: 20 + x2 = -2x Solving 20 + x2 = -2x Solving for variable 'x'. Reorder the terms: 20 + 2x + x2 = -2x + 2x Combine like terms: -2x + 2x = 0 20 + 2x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-20' to each side of the equation. 20 + 2x + -20 + x2 = 0 + -20 Reorder the terms: 20 + -20 + 2x + x2 = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 2x + x2 = 0 + -20 2x + x2 = 0 + -20 Combine like terms: 0 + -20 = -20 2x + x2 = -20 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 = -20 + 1 Reorder the terms: 1 + 2x + x2 = -20 + 1 Combine like terms: -20 + 1 = -19 1 + 2x + x2 = -19 Factor a perfect square on the left side: (x + 1)(x + 1) = -19 Can't calculate square root of the right side. The solution to this equation could not be determined.
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