x^2+8x-20=6

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Solution for x^2+8x-20=6 equation:


Simplifying
x2 + 8x + -20 = 6

Reorder the terms:
-20 + 8x + x2 = 6

Solving
-20 + 8x + x2 = 6

Solving for variable 'x'.

Reorder the terms:
-20 + -6 + 8x + x2 = 6 + -6

Combine like terms: -20 + -6 = -26
-26 + 8x + x2 = 6 + -6

Combine like terms: 6 + -6 = 0
-26 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '26' to each side of the equation.
-26 + 8x + 26 + x2 = 0 + 26

Reorder the terms:
-26 + 26 + 8x + x2 = 0 + 26

Combine like terms: -26 + 26 = 0
0 + 8x + x2 = 0 + 26
8x + x2 = 0 + 26

Combine like terms: 0 + 26 = 26
8x + x2 = 26

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 = 26 + 16

Reorder the terms:
16 + 8x + x2 = 26 + 16

Combine like terms: 26 + 16 = 42
16 + 8x + x2 = 42

Factor a perfect square on the left side:
(x + 4)(x + 4) = 42

Calculate the square root of the right side: 6.480740698

Break this problem into two subproblems by setting 
(x + 4) equal to 6.480740698 and -6.480740698.

Subproblem 1

x + 4 = 6.480740698 Simplifying x + 4 = 6.480740698 Reorder the terms: 4 + x = 6.480740698 Solving 4 + x = 6.480740698 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 = 6.480740698 + -4 Combine like terms: 4 + -4 = 0 0 + x = 6.480740698 + -4 x = 6.480740698 + -4 Combine like terms: 6.480740698 + -4 = 2.480740698 x = 2.480740698 Simplifying x = 2.480740698

Subproblem 2

x + 4 = -6.480740698 Simplifying x + 4 = -6.480740698 Reorder the terms: 4 + x = -6.480740698 Solving 4 + x = -6.480740698 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 = -6.480740698 + -4 Combine like terms: 4 + -4 = 0 0 + x = -6.480740698 + -4 x = -6.480740698 + -4 Combine like terms: -6.480740698 + -4 = -10.480740698 x = -10.480740698 Simplifying x = -10.480740698

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.480740698, -10.480740698}

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