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Simplifying (-7x + 3) + (-2x2 + 12x + -7) = 0 Reorder the terms: (3 + -7x) + (-2x2 + 12x + -7) = 0 Remove parenthesis around (3 + -7x) 3 + -7x + (-2x2 + 12x + -7) = 0 Reorder the terms: 3 + -7x + (-7 + 12x + -2x2) = 0 Remove parenthesis around (-7 + 12x + -2x2) 3 + -7x + -7 + 12x + -2x2 = 0 Reorder the terms: 3 + -7 + -7x + 12x + -2x2 = 0 Combine like terms: 3 + -7 = -4 -4 + -7x + 12x + -2x2 = 0 Combine like terms: -7x + 12x = 5x -4 + 5x + -2x2 = 0 Solving -4 + 5x + -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 + -2.5x + x2 = 0 Move the constant term to the right: Add '-2' to each side of the equation. 2 + -2.5x + -2 + x2 = 0 + -2 Reorder the terms: 2 + -2 + -2.5x + x2 = 0 + -2 Combine like terms: 2 + -2 = 0 0 + -2.5x + x2 = 0 + -2 -2.5x + x2 = 0 + -2 Combine like terms: 0 + -2 = -2 -2.5x + x2 = -2 The x term is -2.5x. Take half its coefficient (-1.25). Square it (1.5625) and add it to both sides. Add '1.5625' to each side of the equation. -2.5x + 1.5625 + x2 = -2 + 1.5625 Reorder the terms: 1.5625 + -2.5x + x2 = -2 + 1.5625 Combine like terms: -2 + 1.5625 = -0.4375 1.5625 + -2.5x + x2 = -0.4375 Factor a perfect square on the left side: (x + -1.25)(x + -1.25) = -0.4375 Can't calculate square root of the right side. The solution to this equation could not be determined.
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