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Simplifying 9x2 + -12x + 16 + -4x2 + 4x + -1 = 0 Reorder the terms: 16 + -1 + -12x + 4x + 9x2 + -4x2 = 0 Combine like terms: 16 + -1 = 15 15 + -12x + 4x + 9x2 + -4x2 = 0 Combine like terms: -12x + 4x = -8x 15 + -8x + 9x2 + -4x2 = 0 Combine like terms: 9x2 + -4x2 = 5x2 15 + -8x + 5x2 = 0 Solving 15 + -8x + 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 + -1.6x + x2 = 0 Move the constant term to the right: Add '-3' to each side of the equation. 3 + -1.6x + -3 + x2 = 0 + -3 Reorder the terms: 3 + -3 + -1.6x + x2 = 0 + -3 Combine like terms: 3 + -3 = 0 0 + -1.6x + x2 = 0 + -3 -1.6x + x2 = 0 + -3 Combine like terms: 0 + -3 = -3 -1.6x + x2 = -3 The x term is -1.6x. Take half its coefficient (-0.8). Square it (0.64) and add it to both sides. Add '0.64' to each side of the equation. -1.6x + 0.64 + x2 = -3 + 0.64 Reorder the terms: 0.64 + -1.6x + x2 = -3 + 0.64 Combine like terms: -3 + 0.64 = -2.36 0.64 + -1.6x + x2 = -2.36 Factor a perfect square on the left side: (x + -0.8)(x + -0.8) = -2.36 Can't calculate square root of the right side. The solution to this equation could not be determined.
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