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Simplifying 5x2 + 12x + 15 = 0 Reorder the terms: 15 + 12x + 5x2 = 0 Solving 15 + 12x + 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'. 3 + 2.4x + x2 = 0 Move the constant term to the right: Add '-3' to each side of the equation. 3 + 2.4x + -3 + x2 = 0 + -3 Reorder the terms: 3 + -3 + 2.4x + x2 = 0 + -3 Combine like terms: 3 + -3 = 0 0 + 2.4x + x2 = 0 + -3 2.4x + x2 = 0 + -3 Combine like terms: 0 + -3 = -3 2.4x + x2 = -3 The x term is 2.4x. Take half its coefficient (1.2). Square it (1.44) and add it to both sides. Add '1.44' to each side of the equation. 2.4x + 1.44 + x2 = -3 + 1.44 Reorder the terms: 1.44 + 2.4x + x2 = -3 + 1.44 Combine like terms: -3 + 1.44 = -1.56 1.44 + 2.4x + x2 = -1.56 Factor a perfect square on the left side: (x + 1.2)(x + 1.2) = -1.56 Can't calculate square root of the right side. The solution to this equation could not be determined.
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