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Simplifying (5x2 + -1x + -7) + (2x2 + 3x + 4) = 0 Reorder the terms: (-7 + -1x + 5x2) + (2x2 + 3x + 4) = 0 Remove parenthesis around (-7 + -1x + 5x2) -7 + -1x + 5x2 + (2x2 + 3x + 4) = 0 Reorder the terms: -7 + -1x + 5x2 + (4 + 3x + 2x2) = 0 Remove parenthesis around (4 + 3x + 2x2) -7 + -1x + 5x2 + 4 + 3x + 2x2 = 0 Reorder the terms: -7 + 4 + -1x + 3x + 5x2 + 2x2 = 0 Combine like terms: -7 + 4 = -3 -3 + -1x + 3x + 5x2 + 2x2 = 0 Combine like terms: -1x + 3x = 2x -3 + 2x + 5x2 + 2x2 = 0 Combine like terms: 5x2 + 2x2 = 7x2 -3 + 2x + 7x2 = 0 Solving -3 + 2x + 7x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 7 the coefficient of the squared term: Divide each side by '7'. -0.4285714286 + 0.2857142857x + x2 = 0 Move the constant term to the right: Add '0.4285714286' to each side of the equation. -0.4285714286 + 0.2857142857x + 0.4285714286 + x2 = 0 + 0.4285714286 Reorder the terms: -0.4285714286 + 0.4285714286 + 0.2857142857x + x2 = 0 + 0.4285714286 Combine like terms: -0.4285714286 + 0.4285714286 = 0.0000000000 0.0000000000 + 0.2857142857x + x2 = 0 + 0.4285714286 0.2857142857x + x2 = 0 + 0.4285714286 Combine like terms: 0 + 0.4285714286 = 0.4285714286 0.2857142857x + x2 = 0.4285714286 The x term is 0.2857142857x. Take half its coefficient (0.1428571429). Square it (0.02040816328) and add it to both sides. Add '0.02040816328' to each side of the equation. 0.2857142857x + 0.02040816328 + x2 = 0.4285714286 + 0.02040816328 Reorder the terms: 0.02040816328 + 0.2857142857x + x2 = 0.4285714286 + 0.02040816328 Combine like terms: 0.4285714286 + 0.02040816328 = 0.44897959188 0.02040816328 + 0.2857142857x + x2 = 0.44897959188 Factor a perfect square on the left side: (x + 0.1428571429)(x + 0.1428571429) = 0.44897959188 Calculate the square root of the right side: 0.670059394 Break this problem into two subproblems by setting (x + 0.1428571429) equal to 0.670059394 and -0.670059394.Subproblem 1
x + 0.1428571429 = 0.670059394 Simplifying x + 0.1428571429 = 0.670059394 Reorder the terms: 0.1428571429 + x = 0.670059394 Solving 0.1428571429 + x = 0.670059394 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1428571429' to each side of the equation. 0.1428571429 + -0.1428571429 + x = 0.670059394 + -0.1428571429 Combine like terms: 0.1428571429 + -0.1428571429 = 0.0000000000 0.0000000000 + x = 0.670059394 + -0.1428571429 x = 0.670059394 + -0.1428571429 Combine like terms: 0.670059394 + -0.1428571429 = 0.5272022511 x = 0.5272022511 Simplifying x = 0.5272022511Subproblem 2
x + 0.1428571429 = -0.670059394 Simplifying x + 0.1428571429 = -0.670059394 Reorder the terms: 0.1428571429 + x = -0.670059394 Solving 0.1428571429 + x = -0.670059394 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1428571429' to each side of the equation. 0.1428571429 + -0.1428571429 + x = -0.670059394 + -0.1428571429 Combine like terms: 0.1428571429 + -0.1428571429 = 0.0000000000 0.0000000000 + x = -0.670059394 + -0.1428571429 x = -0.670059394 + -0.1428571429 Combine like terms: -0.670059394 + -0.1428571429 = -0.8129165369 x = -0.8129165369 Simplifying x = -0.8129165369Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.5272022511, -0.8129165369}
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