x^2-2x-2=65

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Solution for x^2-2x-2=65 equation:


Simplifying
x2 + -2x + -2 = 65

Reorder the terms:
-2 + -2x + x2 = 65

Solving
-2 + -2x + x2 = 65

Solving for variable 'x'.

Reorder the terms:
-2 + -65 + -2x + x2 = 65 + -65

Combine like terms: -2 + -65 = -67
-67 + -2x + x2 = 65 + -65

Combine like terms: 65 + -65 = 0
-67 + -2x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '67' to each side of the equation.
-67 + -2x + 67 + x2 = 0 + 67

Reorder the terms:
-67 + 67 + -2x + x2 = 0 + 67

Combine like terms: -67 + 67 = 0
0 + -2x + x2 = 0 + 67
-2x + x2 = 0 + 67

Combine like terms: 0 + 67 = 67
-2x + x2 = 67

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 67 + 1

Reorder the terms:
1 + -2x + x2 = 67 + 1

Combine like terms: 67 + 1 = 68
1 + -2x + x2 = 68

Factor a perfect square on the left side:
(x + -1)(x + -1) = 68

Calculate the square root of the right side: 8.246211251

Break this problem into two subproblems by setting 
(x + -1) equal to 8.246211251 and -8.246211251.

Subproblem 1

x + -1 = 8.246211251 Simplifying x + -1 = 8.246211251 Reorder the terms: -1 + x = 8.246211251 Solving -1 + x = 8.246211251 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 8.246211251 + 1 Combine like terms: -1 + 1 = 0 0 + x = 8.246211251 + 1 x = 8.246211251 + 1 Combine like terms: 8.246211251 + 1 = 9.246211251 x = 9.246211251 Simplifying x = 9.246211251

Subproblem 2

x + -1 = -8.246211251 Simplifying x + -1 = -8.246211251 Reorder the terms: -1 + x = -8.246211251 Solving -1 + x = -8.246211251 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -8.246211251 + 1 Combine like terms: -1 + 1 = 0 0 + x = -8.246211251 + 1 x = -8.246211251 + 1 Combine like terms: -8.246211251 + 1 = -7.246211251 x = -7.246211251 Simplifying x = -7.246211251

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.246211251, -7.246211251}

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