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Simplifying 3x2 + 15x + 56.25 = 0 Reorder the terms: 56.25 + 15x + 3x2 = 0 Solving 56.25 + 15x + 3x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 3 the coefficient of the squared term: Divide each side by '3'. 18.75 + 5x + x2 = 0 Move the constant term to the right: Add '-18.75' to each side of the equation. 18.75 + 5x + -18.75 + x2 = 0 + -18.75 Reorder the terms: 18.75 + -18.75 + 5x + x2 = 0 + -18.75 Combine like terms: 18.75 + -18.75 = 0.00 0.00 + 5x + x2 = 0 + -18.75 5x + x2 = 0 + -18.75 Combine like terms: 0 + -18.75 = -18.75 5x + x2 = -18.75 The x term is 5x. Take half its coefficient (2.5). Square it (6.25) and add it to both sides. Add '6.25' to each side of the equation. 5x + 6.25 + x2 = -18.75 + 6.25 Reorder the terms: 6.25 + 5x + x2 = -18.75 + 6.25 Combine like terms: -18.75 + 6.25 = -12.5 6.25 + 5x + x2 = -12.5 Factor a perfect square on the left side: (x + 2.5)(x + 2.5) = -12.5 Can't calculate square root of the right side. The solution to this equation could not be determined.
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