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Simplifying 7 + -1x(x + -4) = 19 Reorder the terms: 7 + -1x(-4 + x) = 19 7 + (-4 * -1x + x * -1x) = 19 7 + (4x + -1x2) = 19 Solving 7 + 4x + -1x2 = 19 Solving for variable 'x'. Reorder the terms: 7 + -19 + 4x + -1x2 = 19 + -19 Combine like terms: 7 + -19 = -12 -12 + 4x + -1x2 = 19 + -19 Combine like terms: 19 + -19 = 0 -12 + 4x + -1x2 = 0 Begin completing the square. Divide all terms by -1 the coefficient of the squared term: Divide each side by '-1'. 12 + -4x + x2 = 0 Move the constant term to the right: Add '-12' to each side of the equation. 12 + -4x + -12 + x2 = 0 + -12 Reorder the terms: 12 + -12 + -4x + x2 = 0 + -12 Combine like terms: 12 + -12 = 0 0 + -4x + x2 = 0 + -12 -4x + x2 = 0 + -12 Combine like terms: 0 + -12 = -12 -4x + x2 = -12 The x term is -4x. Take half its coefficient (-2). Square it (4) and add it to both sides. Add '4' to each side of the equation. -4x + 4 + x2 = -12 + 4 Reorder the terms: 4 + -4x + x2 = -12 + 4 Combine like terms: -12 + 4 = -8 4 + -4x + x2 = -8 Factor a perfect square on the left side: (x + -2)(x + -2) = -8 Can't calculate square root of the right side. The solution to this equation could not be determined.
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