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Simplifying 5x2 + 4x + 40 = 0 Reorder the terms: 40 + 4x + 5x2 = 0 Solving 40 + 4x + 5x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. 8 + 0.8x + x2 = 0 Move the constant term to the right: Add '-8' to each side of the equation. 8 + 0.8x + -8 + x2 = 0 + -8 Reorder the terms: 8 + -8 + 0.8x + x2 = 0 + -8 Combine like terms: 8 + -8 = 0 0 + 0.8x + x2 = 0 + -8 0.8x + x2 = 0 + -8 Combine like terms: 0 + -8 = -8 0.8x + x2 = -8 The x term is 0.8x. Take half its coefficient (0.4). Square it (0.16) and add it to both sides. Add '0.16' to each side of the equation. 0.8x + 0.16 + x2 = -8 + 0.16 Reorder the terms: 0.16 + 0.8x + x2 = -8 + 0.16 Combine like terms: -8 + 0.16 = -7.84 0.16 + 0.8x + x2 = -7.84 Factor a perfect square on the left side: (x + 0.4)(x + 0.4) = -7.84 Can't calculate square root of the right side. The solution to this equation could not be determined.
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