16-8+x^2+8x+2x-1=0

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Solution for 16-8+x^2+8x+2x-1=0 equation:


Simplifying
16 + -8 + x2 + 8x + 2x + -1 = 0

Reorder the terms:
16 + -8 + -1 + 8x + 2x + x2 = 0

Combine like terms: 16 + -8 = 8
8 + -1 + 8x + 2x + x2 = 0

Combine like terms: 8 + -1 = 7
7 + 8x + 2x + x2 = 0

Combine like terms: 8x + 2x = 10x
7 + 10x + x2 = 0

Solving
7 + 10x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + 10x + -7 + x2 = 0 + -7

Reorder the terms:
7 + -7 + 10x + x2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + 10x + x2 = 0 + -7
10x + x2 = 0 + -7

Combine like terms: 0 + -7 = -7
10x + x2 = -7

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = -7 + 25

Reorder the terms:
25 + 10x + x2 = -7 + 25

Combine like terms: -7 + 25 = 18
25 + 10x + x2 = 18

Factor a perfect square on the left side:
(x + 5)(x + 5) = 18

Calculate the square root of the right side: 4.242640687

Break this problem into two subproblems by setting 
(x + 5) equal to 4.242640687 and -4.242640687.

Subproblem 1

x + 5 = 4.242640687 Simplifying x + 5 = 4.242640687 Reorder the terms: 5 + x = 4.242640687 Solving 5 + x = 4.242640687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 4.242640687 + -5 Combine like terms: 5 + -5 = 0 0 + x = 4.242640687 + -5 x = 4.242640687 + -5 Combine like terms: 4.242640687 + -5 = -0.757359313 x = -0.757359313 Simplifying x = -0.757359313

Subproblem 2

x + 5 = -4.242640687 Simplifying x + 5 = -4.242640687 Reorder the terms: 5 + x = -4.242640687 Solving 5 + x = -4.242640687 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -4.242640687 + -5 Combine like terms: 5 + -5 = 0 0 + x = -4.242640687 + -5 x = -4.242640687 + -5 Combine like terms: -4.242640687 + -5 = -9.242640687 x = -9.242640687 Simplifying x = -9.242640687

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.757359313, -9.242640687}

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