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Simplifying x2 + 3x2 + -9x + -18 = 0 Reorder the terms: -18 + -9x + x2 + 3x2 = 0 Combine like terms: x2 + 3x2 = 4x2 -18 + -9x + 4x2 = 0 Solving -18 + -9x + 4x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 4 the coefficient of the squared term: Divide each side by '4'. -4.5 + -2.25x + x2 = 0 Move the constant term to the right: Add '4.5' to each side of the equation. -4.5 + -2.25x + 4.5 + x2 = 0 + 4.5 Reorder the terms: -4.5 + 4.5 + -2.25x + x2 = 0 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + -2.25x + x2 = 0 + 4.5 -2.25x + x2 = 0 + 4.5 Combine like terms: 0 + 4.5 = 4.5 -2.25x + x2 = 4.5 The x term is -2.25x. Take half its coefficient (-1.125). Square it (1.265625) and add it to both sides. Add '1.265625' to each side of the equation. -2.25x + 1.265625 + x2 = 4.5 + 1.265625 Reorder the terms: 1.265625 + -2.25x + x2 = 4.5 + 1.265625 Combine like terms: 4.5 + 1.265625 = 5.765625 1.265625 + -2.25x + x2 = 5.765625 Factor a perfect square on the left side: (x + -1.125)(x + -1.125) = 5.765625 Calculate the square root of the right side: 2.401171589 Break this problem into two subproblems by setting (x + -1.125) equal to 2.401171589 and -2.401171589.Subproblem 1
x + -1.125 = 2.401171589 Simplifying x + -1.125 = 2.401171589 Reorder the terms: -1.125 + x = 2.401171589 Solving -1.125 + x = 2.401171589 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = 2.401171589 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = 2.401171589 + 1.125 x = 2.401171589 + 1.125 Combine like terms: 2.401171589 + 1.125 = 3.526171589 x = 3.526171589 Simplifying x = 3.526171589Subproblem 2
x + -1.125 = -2.401171589 Simplifying x + -1.125 = -2.401171589 Reorder the terms: -1.125 + x = -2.401171589 Solving -1.125 + x = -2.401171589 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = -2.401171589 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = -2.401171589 + 1.125 x = -2.401171589 + 1.125 Combine like terms: -2.401171589 + 1.125 = -1.276171589 x = -1.276171589 Simplifying x = -1.276171589Solution
The solution to the problem is based on the solutions from the subproblems. x = {3.526171589, -1.276171589}
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