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Simplifying x2 + -8x + 16 = 84 Reorder the terms: 16 + -8x + x2 = 84 Solving 16 + -8x + x2 = 84 Solving for variable 'x'. Reorder the terms: 16 + -84 + -8x + x2 = 84 + -84 Combine like terms: 16 + -84 = -68 -68 + -8x + x2 = 84 + -84 Combine like terms: 84 + -84 = 0 -68 + -8x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '68' to each side of the equation. -68 + -8x + 68 + x2 = 0 + 68 Reorder the terms: -68 + 68 + -8x + x2 = 0 + 68 Combine like terms: -68 + 68 = 0 0 + -8x + x2 = 0 + 68 -8x + x2 = 0 + 68 Combine like terms: 0 + 68 = 68 -8x + x2 = 68 The x term is -8x. Take half its coefficient (-4). Square it (16) and add it to both sides. Add '16' to each side of the equation. -8x + 16 + x2 = 68 + 16 Reorder the terms: 16 + -8x + x2 = 68 + 16 Combine like terms: 68 + 16 = 84 16 + -8x + x2 = 84 Factor a perfect square on the left side: (x + -4)(x + -4) = 84 Calculate the square root of the right side: 9.16515139 Break this problem into two subproblems by setting (x + -4) equal to 9.16515139 and -9.16515139.Subproblem 1
x + -4 = 9.16515139 Simplifying x + -4 = 9.16515139 Reorder the terms: -4 + x = 9.16515139 Solving -4 + x = 9.16515139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 9.16515139 + 4 Combine like terms: -4 + 4 = 0 0 + x = 9.16515139 + 4 x = 9.16515139 + 4 Combine like terms: 9.16515139 + 4 = 13.16515139 x = 13.16515139 Simplifying x = 13.16515139Subproblem 2
x + -4 = -9.16515139 Simplifying x + -4 = -9.16515139 Reorder the terms: -4 + x = -9.16515139 Solving -4 + x = -9.16515139 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -9.16515139 + 4 Combine like terms: -4 + 4 = 0 0 + x = -9.16515139 + 4 x = -9.16515139 + 4 Combine like terms: -9.16515139 + 4 = -5.16515139 x = -5.16515139 Simplifying x = -5.16515139Solution
The solution to the problem is based on the solutions from the subproblems. x = {13.16515139, -5.16515139}
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