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Simplifying 5x2 + -7x + 12 = 3 Reorder the terms: 12 + -7x + 5x2 = 3 Solving 12 + -7x + 5x2 = 3 Solving for variable 'x'. Reorder the terms: 12 + -3 + -7x + 5x2 = 3 + -3 Combine like terms: 12 + -3 = 9 9 + -7x + 5x2 = 3 + -3 Combine like terms: 3 + -3 = 0 9 + -7x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. 1.8 + -1.4x + x2 = 0 Move the constant term to the right: Add '-1.8' to each side of the equation. 1.8 + -1.4x + -1.8 + x2 = 0 + -1.8 Reorder the terms: 1.8 + -1.8 + -1.4x + x2 = 0 + -1.8 Combine like terms: 1.8 + -1.8 = 0.0 0.0 + -1.4x + x2 = 0 + -1.8 -1.4x + x2 = 0 + -1.8 Combine like terms: 0 + -1.8 = -1.8 -1.4x + x2 = -1.8 The x term is -1.4x. Take half its coefficient (-0.7). Square it (0.49) and add it to both sides. Add '0.49' to each side of the equation. -1.4x + 0.49 + x2 = -1.8 + 0.49 Reorder the terms: 0.49 + -1.4x + x2 = -1.8 + 0.49 Combine like terms: -1.8 + 0.49 = -1.31 0.49 + -1.4x + x2 = -1.31 Factor a perfect square on the left side: (x + -0.7)(x + -0.7) = -1.31 Can't calculate square root of the right side. The solution to this equation could not be determined.
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