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Simplifying 7x2 + -4 + 7x + -9x2 + -4x = 0 Reorder the terms: -4 + 7x + -4x + 7x2 + -9x2 = 0 Combine like terms: 7x + -4x = 3x -4 + 3x + 7x2 + -9x2 = 0 Combine like terms: 7x2 + -9x2 = -2x2 -4 + 3x + -2x2 = 0 Solving -4 + 3x + -2x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -2 the coefficient of the squared term: Divide each side by '-2'. 2 + -1.5x + x2 = 0 Move the constant term to the right: Add '-2' to each side of the equation. 2 + -1.5x + -2 + x2 = 0 + -2 Reorder the terms: 2 + -2 + -1.5x + x2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -1.5x + x2 = 0 + -2 -1.5x + x2 = 0 + -2 Combine like terms: 0 + -2 = -2 -1.5x + x2 = -2 The x term is -1.5x. Take half its coefficient (-0.75). Square it (0.5625) and add it to both sides. Add '0.5625' to each side of the equation. -1.5x + 0.5625 + x2 = -2 + 0.5625 Reorder the terms: 0.5625 + -1.5x + x2 = -2 + 0.5625 Combine like terms: -2 + 0.5625 = -1.4375 0.5625 + -1.5x + x2 = -1.4375 Factor a perfect square on the left side: (x + -0.75)(x + -0.75) = -1.4375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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