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Simplifying x2 + -28x = 15 Reorder the terms: -28x + x2 = 15 Solving -28x + x2 = 15 Solving for variable 'x'. Reorder the terms: -15 + -28x + x2 = 15 + -15 Combine like terms: 15 + -15 = 0 -15 + -28x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '15' to each side of the equation. -15 + -28x + 15 + x2 = 0 + 15 Reorder the terms: -15 + 15 + -28x + x2 = 0 + 15 Combine like terms: -15 + 15 = 0 0 + -28x + x2 = 0 + 15 -28x + x2 = 0 + 15 Combine like terms: 0 + 15 = 15 -28x + x2 = 15 The x term is -28x. Take half its coefficient (-14). Square it (196) and add it to both sides. Add '196' to each side of the equation. -28x + 196 + x2 = 15 + 196 Reorder the terms: 196 + -28x + x2 = 15 + 196 Combine like terms: 15 + 196 = 211 196 + -28x + x2 = 211 Factor a perfect square on the left side: (x + -14)(x + -14) = 211 Calculate the square root of the right side: 14.525839046 Break this problem into two subproblems by setting (x + -14) equal to 14.525839046 and -14.525839046.Subproblem 1
x + -14 = 14.525839046 Simplifying x + -14 = 14.525839046 Reorder the terms: -14 + x = 14.525839046 Solving -14 + x = 14.525839046 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = 14.525839046 + 14 Combine like terms: -14 + 14 = 0 0 + x = 14.525839046 + 14 x = 14.525839046 + 14 Combine like terms: 14.525839046 + 14 = 28.525839046 x = 28.525839046 Simplifying x = 28.525839046Subproblem 2
x + -14 = -14.525839046 Simplifying x + -14 = -14.525839046 Reorder the terms: -14 + x = -14.525839046 Solving -14 + x = -14.525839046 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '14' to each side of the equation. -14 + 14 + x = -14.525839046 + 14 Combine like terms: -14 + 14 = 0 0 + x = -14.525839046 + 14 x = -14.525839046 + 14 Combine like terms: -14.525839046 + 14 = -0.525839046 x = -0.525839046 Simplifying x = -0.525839046Solution
The solution to the problem is based on the solutions from the subproblems. x = {28.525839046, -0.525839046}
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