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Simplifying x2 + 7x = -20 Reorder the terms: 7x + x2 = -20 Solving 7x + x2 = -20 Solving for variable 'x'. Reorder the terms: 20 + 7x + x2 = -20 + 20 Combine like terms: -20 + 20 = 0 20 + 7x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '-20' to each side of the equation. 20 + 7x + -20 + x2 = 0 + -20 Reorder the terms: 20 + -20 + 7x + x2 = 0 + -20 Combine like terms: 20 + -20 = 0 0 + 7x + x2 = 0 + -20 7x + x2 = 0 + -20 Combine like terms: 0 + -20 = -20 7x + x2 = -20 The x term is 7x. Take half its coefficient (3.5). Square it (12.25) and add it to both sides. Add '12.25' to each side of the equation. 7x + 12.25 + x2 = -20 + 12.25 Reorder the terms: 12.25 + 7x + x2 = -20 + 12.25 Combine like terms: -20 + 12.25 = -7.75 12.25 + 7x + x2 = -7.75 Factor a perfect square on the left side: (x + 3.5)(x + 3.5) = -7.75 Can't calculate square root of the right side. The solution to this equation could not be determined.
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