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Simplifying (6x2) + 8x + -7 = x2 Reorder the terms: -7 + 8x + (6x2) = x2 Solving -7 + 8x + (6x2) = x2 Solving for variable 'x'. Combine like terms: (6x2) + -1x2 = 5x2 -7 + 8x + 5x2 = x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -7 + 8x + 5x2 = 0 Begin completing the square. Divide all terms by 5 the coefficient of the squared term: Divide each side by '5'. -1.4 + 1.6x + x2 = 0 Move the constant term to the right: Add '1.4' to each side of the equation. -1.4 + 1.6x + 1.4 + x2 = 0 + 1.4 Reorder the terms: -1.4 + 1.4 + 1.6x + x2 = 0 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + 1.6x + x2 = 0 + 1.4 1.6x + x2 = 0 + 1.4 Combine like terms: 0 + 1.4 = 1.4 1.6x + x2 = 1.4 The x term is 1.6x. Take half its coefficient (0.8). Square it (0.64) and add it to both sides. Add '0.64' to each side of the equation. 1.6x + 0.64 + x2 = 1.4 + 0.64 Reorder the terms: 0.64 + 1.6x + x2 = 1.4 + 0.64 Combine like terms: 1.4 + 0.64 = 2.04 0.64 + 1.6x + x2 = 2.04 Factor a perfect square on the left side: (x + 0.8)(x + 0.8) = 2.04 Calculate the square root of the right side: 1.428285686 Break this problem into two subproblems by setting (x + 0.8) equal to 1.428285686 and -1.428285686.Subproblem 1
x + 0.8 = 1.428285686 Simplifying x + 0.8 = 1.428285686 Reorder the terms: 0.8 + x = 1.428285686 Solving 0.8 + x = 1.428285686 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = 1.428285686 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = 1.428285686 + -0.8 x = 1.428285686 + -0.8 Combine like terms: 1.428285686 + -0.8 = 0.628285686 x = 0.628285686 Simplifying x = 0.628285686Subproblem 2
x + 0.8 = -1.428285686 Simplifying x + 0.8 = -1.428285686 Reorder the terms: 0.8 + x = -1.428285686 Solving 0.8 + x = -1.428285686 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = -1.428285686 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = -1.428285686 + -0.8 x = -1.428285686 + -0.8 Combine like terms: -1.428285686 + -0.8 = -2.228285686 x = -2.228285686 Simplifying x = -2.228285686Solution
The solution to the problem is based on the solutions from the subproblems. x = {0.628285686, -2.228285686}
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