2x^2-8x-82=-6

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Solution for 2x^2-8x-82=-6 equation:


Simplifying
2x2 + -8x + -82 = -6

Reorder the terms:
-82 + -8x + 2x2 = -6

Solving
-82 + -8x + 2x2 = -6

Solving for variable 'x'.

Reorder the terms:
-82 + 6 + -8x + 2x2 = -6 + 6

Combine like terms: -82 + 6 = -76
-76 + -8x + 2x2 = -6 + 6

Combine like terms: -6 + 6 = 0
-76 + -8x + 2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-38 + -4x + x2) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-38 + -4x + x2)' equal to zero and attempt to solve: Simplifying -38 + -4x + x2 = 0 Solving -38 + -4x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '38' to each side of the equation. -38 + -4x + 38 + x2 = 0 + 38 Reorder the terms: -38 + 38 + -4x + x2 = 0 + 38 Combine like terms: -38 + 38 = 0 0 + -4x + x2 = 0 + 38 -4x + x2 = 0 + 38 Combine like terms: 0 + 38 = 38 -4x + x2 = 38 The x term is -4x. Take half its coefficient (-2). Square it (4) and add it to both sides. Add '4' to each side of the equation. -4x + 4 + x2 = 38 + 4 Reorder the terms: 4 + -4x + x2 = 38 + 4 Combine like terms: 38 + 4 = 42 4 + -4x + x2 = 42 Factor a perfect square on the left side: (x + -2)(x + -2) = 42 Calculate the square root of the right side: 6.480740698 Break this problem into two subproblems by setting (x + -2) equal to 6.480740698 and -6.480740698.

Subproblem 1

x + -2 = 6.480740698 Simplifying x + -2 = 6.480740698 Reorder the terms: -2 + x = 6.480740698 Solving -2 + x = 6.480740698 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 6.480740698 + 2 Combine like terms: -2 + 2 = 0 0 + x = 6.480740698 + 2 x = 6.480740698 + 2 Combine like terms: 6.480740698 + 2 = 8.480740698 x = 8.480740698 Simplifying x = 8.480740698

Subproblem 2

x + -2 = -6.480740698 Simplifying x + -2 = -6.480740698 Reorder the terms: -2 + x = -6.480740698 Solving -2 + x = -6.480740698 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -6.480740698 + 2 Combine like terms: -2 + 2 = 0 0 + x = -6.480740698 + 2 x = -6.480740698 + 2 Combine like terms: -6.480740698 + 2 = -4.480740698 x = -4.480740698 Simplifying x = -4.480740698

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.480740698, -4.480740698}

Solution

x = {8.480740698, -4.480740698}

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