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Simplifying 15x + 15 = -4x2 Reorder the terms: 15 + 15x = -4x2 Solving 15 + 15x = -4x2 Solving for variable 'x'. Combine like terms: -4x2 + 4x2 = 0 15 + 15x + 4x2 = 0 Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. 3.75 + 3.75x + x2 = 0 Move the constant term to the right: Add '-3.75' to each side of the equation. 3.75 + 3.75x + -3.75 + x2 = 0 + -3.75 Reorder the terms: 3.75 + -3.75 + 3.75x + x2 = 0 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + 3.75x + x2 = 0 + -3.75 3.75x + x2 = 0 + -3.75 Combine like terms: 0 + -3.75 = -3.75 3.75x + x2 = -3.75 The x term is 3.75x. Take half its coefficient (1.875). Square it (3.515625) and add it to both sides. Add '3.515625' to each side of the equation. 3.75x + 3.515625 + x2 = -3.75 + 3.515625 Reorder the terms: 3.515625 + 3.75x + x2 = -3.75 + 3.515625 Combine like terms: -3.75 + 3.515625 = -0.234375 3.515625 + 3.75x + x2 = -0.234375 Factor a perfect square on the left side: (x + 1.875)(x + 1.875) = -0.234375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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