x^2-2x=6x+40

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Solution for x^2-2x=6x+40 equation:


Simplifying
x2 + -2x = 6x + 40

Reorder the terms:
-2x + x2 = 6x + 40

Reorder the terms:
-2x + x2 = 40 + 6x

Solving
-2x + x2 = 40 + 6x

Solving for variable 'x'.

Reorder the terms:
-40 + -2x + -6x + x2 = 40 + 6x + -40 + -6x

Combine like terms: -2x + -6x = -8x
-40 + -8x + x2 = 40 + 6x + -40 + -6x

Reorder the terms:
-40 + -8x + x2 = 40 + -40 + 6x + -6x

Combine like terms: 40 + -40 = 0
-40 + -8x + x2 = 0 + 6x + -6x
-40 + -8x + x2 = 6x + -6x

Combine like terms: 6x + -6x = 0
-40 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -8x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -8x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -8x + x2 = 0 + 40
-8x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
-8x + x2 = 40

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 = 40 + 16

Reorder the terms:
16 + -8x + x2 = 40 + 16

Combine like terms: 40 + 16 = 56
16 + -8x + x2 = 56

Factor a perfect square on the left side:
(x + -4)(x + -4) = 56

Calculate the square root of the right side: 7.483314774

Break this problem into two subproblems by setting 
(x + -4) equal to 7.483314774 and -7.483314774.

Subproblem 1

x + -4 = 7.483314774 Simplifying x + -4 = 7.483314774 Reorder the terms: -4 + x = 7.483314774 Solving -4 + x = 7.483314774 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 = 7.483314774 + 4 Combine like terms: -4 + 4 = 0 0 + x = 7.483314774 + 4 x = 7.483314774 + 4 Combine like terms: 7.483314774 + 4 = 11.483314774 x = 11.483314774 Simplifying x = 11.483314774

Subproblem 2

x + -4 = -7.483314774 Simplifying x + -4 = -7.483314774 Reorder the terms: -4 + x = -7.483314774 Solving -4 + x = -7.483314774 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 = -7.483314774 + 4 Combine like terms: -4 + 4 = 0 0 + x = -7.483314774 + 4 x = -7.483314774 + 4 Combine like terms: -7.483314774 + 4 = -3.483314774 x = -3.483314774 Simplifying x = -3.483314774

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.483314774, -3.483314774}

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