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Simplifying (2x2 + 4x + 1) + -1(7x2 + -3x + -4) = 0 Reorder the terms: (1 + 4x + 2x2) + -1(7x2 + -3x + -4) = 0 Remove parenthesis around (1 + 4x + 2x2) 1 + 4x + 2x2 + -1(7x2 + -3x + -4) = 0 Reorder the terms: 1 + 4x + 2x2 + -1(-4 + -3x + 7x2) = 0 1 + 4x + 2x2 + (-4 * -1 + -3x * -1 + 7x2 * -1) = 0 1 + 4x + 2x2 + (4 + 3x + -7x2) = 0 Reorder the terms: 1 + 4 + 4x + 3x + 2x2 + -7x2 = 0 Combine like terms: 1 + 4 = 5 5 + 4x + 3x + 2x2 + -7x2 = 0 Combine like terms: 4x + 3x = 7x 5 + 7x + 2x2 + -7x2 = 0 Combine like terms: 2x2 + -7x2 = -5x2 5 + 7x + -5x2 = 0 Solving 5 + 7x + -5x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by -5 the coefficient of the squared term: Divide each side by '-5'. -1 + -1.4x + x2 = 0 Move the constant term to the right: Add '1' to each side of the equation. -1 + -1.4x + 1 + x2 = 0 + 1 Reorder the terms: -1 + 1 + -1.4x + x2 = 0 + 1 Combine like terms: -1 + 1 = 0 0 + -1.4x + x2 = 0 + 1 -1.4x + x2 = 0 + 1 Combine like terms: 0 + 1 = 1 -1.4x + x2 = 1 The x term is -1.4x. Take half its coefficient (-0.7). Square it (0.49) and add it to both sides. Add '0.49' to each side of the equation. -1.4x + 0.49 + x2 = 1 + 0.49 Reorder the terms: 0.49 + -1.4x + x2 = 1 + 0.49 Combine like terms: 1 + 0.49 = 1.49 0.49 + -1.4x + x2 = 1.49 Factor a perfect square on the left side: (x + -0.7)(x + -0.7) = 1.49 Calculate the square root of the right side: 1.220655562 Break this problem into two subproblems by setting (x + -0.7) equal to 1.220655562 and -1.220655562.Subproblem 1
x + -0.7 = 1.220655562 Simplifying x + -0.7 = 1.220655562 Reorder the terms: -0.7 + x = 1.220655562 Solving -0.7 + x = 1.220655562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = 1.220655562 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = 1.220655562 + 0.7 x = 1.220655562 + 0.7 Combine like terms: 1.220655562 + 0.7 = 1.920655562 x = 1.920655562 Simplifying x = 1.920655562Subproblem 2
x + -0.7 = -1.220655562 Simplifying x + -0.7 = -1.220655562 Reorder the terms: -0.7 + x = -1.220655562 Solving -0.7 + x = -1.220655562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7' to each side of the equation. -0.7 + 0.7 + x = -1.220655562 + 0.7 Combine like terms: -0.7 + 0.7 = 0.0 0.0 + x = -1.220655562 + 0.7 x = -1.220655562 + 0.7 Combine like terms: -1.220655562 + 0.7 = -0.520655562 x = -0.520655562 Simplifying x = -0.520655562Solution
The solution to the problem is based on the solutions from the subproblems. x = {1.920655562, -0.520655562}
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