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Simplifying 4x2 + 28x + 81 = 0 Reorder the terms: 81 + 28x + 4x2 = 0 Solving 81 + 28x + 4x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 20.25 + 7x + x2 = 0 Move the constant term to the right: Add '-20.25' to each side of the equation. 20.25 + 7x + -20.25 + x2 = 0 + -20.25 Reorder the terms: 20.25 + -20.25 + 7x + x2 = 0 + -20.25 Combine like terms: 20.25 + -20.25 = 0.00 0.00 + 7x + x2 = 0 + -20.25 7x + x2 = 0 + -20.25 Combine like terms: 0 + -20.25 = -20.25 7x + x2 = -20.25 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 = -20.25 + 12.25 Reorder the terms: 12.25 + 7x + x2 = -20.25 + 12.25 Combine like terms: -20.25 + 12.25 = -8 12.25 + 7x + x2 = -8 Factor a perfect square on the left side: (x + 3.5)(x + 3.5) = -8 Can't calculate square root of the right side. The solution to this equation could not be determined.
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