-x^2+8x=-6

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


Simplifying
-1x2 + 8x = -6

Reorder the terms:
8x + -1x2 = -6

Solving
8x + -1x2 = -6

Solving for variable 'x'.

Reorder the terms:
6 + 8x + -1x2 = -6 + 6

Combine like terms: -6 + 6 = 0
6 + 8x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-6 + -8x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -8x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + -8x + x2 = 0 + 6

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

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

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 = 6 + 16

Reorder the terms:
16 + -8x + x2 = 6 + 16

Combine like terms: 6 + 16 = 22
16 + -8x + x2 = 22

Factor a perfect square on the left side:
(x + -4)(x + -4) = 22

Calculate the square root of the right side: 4.69041576

Break this problem into two subproblems by setting 
(x + -4) equal to 4.69041576 and -4.69041576.

Subproblem 1

x + -4 = 4.69041576 Simplifying x + -4 = 4.69041576 Reorder the terms: -4 + x = 4.69041576 Solving -4 + x = 4.69041576 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 = 4.69041576 + 4 Combine like terms: -4 + 4 = 0 0 + x = 4.69041576 + 4 x = 4.69041576 + 4 Combine like terms: 4.69041576 + 4 = 8.69041576 x = 8.69041576 Simplifying x = 8.69041576

Subproblem 2

x + -4 = -4.69041576 Simplifying x + -4 = -4.69041576 Reorder the terms: -4 + x = -4.69041576 Solving -4 + x = -4.69041576 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 = -4.69041576 + 4 Combine like terms: -4 + 4 = 0 0 + x = -4.69041576 + 4 x = -4.69041576 + 4 Combine like terms: -4.69041576 + 4 = -0.69041576 x = -0.69041576 Simplifying x = -0.69041576

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.69041576, -0.69041576}

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