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Simplifying x2 + 8x = -40 Reorder the terms: 8x + x2 = -40 Solving 8x + x2 = -40 Solving for variable 'x'. Reorder the terms: 40 + 8x + x2 = -40 + 40 Combine like terms: -40 + 40 = 0 40 + 8x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-40' to each side of the equation. 40 + 8x + -40 + x2 = 0 + -40 Reorder the terms: 40 + -40 + 8x + x2 = 0 + -40 Combine like terms: 40 + -40 = 0 0 + 8x + x2 = 0 + -40 8x + x2 = 0 + -40 Combine like terms: 0 + -40 = -40 8x + x2 = -40 The x term is 8x. Take half its coefficient (4). Square it (16) and add it to both sides. Add '16' to each side of the equation. 8x + 16 + x2 = -40 + 16 Reorder the terms: 16 + 8x + x2 = -40 + 16 Combine like terms: -40 + 16 = -24 16 + 8x + x2 = -24 Factor a perfect square on the left side: (x + 4)(x + 4) = -24 Can't calculate square root of the right side. The solution to this equation could not be determined.
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