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Simplifying 8x2 + -5x + -28 = 0 Reorder the terms: -28 + -5x + 8x2 = 0 Solving -28 + -5x + 8x2 = 0 Solving for variable 'x'. Begin completing the square. Divide all terms by 8 the coefficient of the squared term: Divide each side by '8'. -3.5 + -0.625x + x2 = 0 Move the constant term to the right: Add '3.5' to each side of the equation. -3.5 + -0.625x + 3.5 + x2 = 0 + 3.5 Reorder the terms: -3.5 + 3.5 + -0.625x + x2 = 0 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + -0.625x + x2 = 0 + 3.5 -0.625x + x2 = 0 + 3.5 Combine like terms: 0 + 3.5 = 3.5 -0.625x + x2 = 3.5 The x term is -0.625x. Take half its coefficient (-0.3125). Square it (0.09765625) and add it to both sides. Add '0.09765625' to each side of the equation. -0.625x + 0.09765625 + x2 = 3.5 + 0.09765625 Reorder the terms: 0.09765625 + -0.625x + x2 = 3.5 + 0.09765625 Combine like terms: 3.5 + 0.09765625 = 3.59765625 0.09765625 + -0.625x + x2 = 3.59765625 Factor a perfect square on the left side: (x + -0.3125)(x + -0.3125) = 3.59765625 Calculate the square root of the right side: 1.896748863 Break this problem into two subproblems by setting (x + -0.3125) equal to 1.896748863 and -1.896748863.Subproblem 1
x + -0.3125 = 1.896748863 Simplifying x + -0.3125 = 1.896748863 Reorder the terms: -0.3125 + x = 1.896748863 Solving -0.3125 + x = 1.896748863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + x = 1.896748863 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + x = 1.896748863 + 0.3125 x = 1.896748863 + 0.3125 Combine like terms: 1.896748863 + 0.3125 = 2.209248863 x = 2.209248863 Simplifying x = 2.209248863Subproblem 2
x + -0.3125 = -1.896748863 Simplifying x + -0.3125 = -1.896748863 Reorder the terms: -0.3125 + x = -1.896748863 Solving -0.3125 + x = -1.896748863 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + x = -1.896748863 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + x = -1.896748863 + 0.3125 x = -1.896748863 + 0.3125 Combine like terms: -1.896748863 + 0.3125 = -1.584248863 x = -1.584248863 Simplifying x = -1.584248863Solution
The solution to the problem is based on the solutions from the subproblems. x = {2.209248863, -1.584248863}
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