0=2-8x-5x^2

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Solution for 0=2-8x-5x^2 equation:


Simplifying
0 = 2 + -8x + -5x2

Solving
0 = 2 + -8x + -5x2

Solving for variable 'x'.

Combine like terms: 0 + -2 = -2
-2 + 8x + 5x2 = 2 + -8x + -5x2 + -2 + 8x + 5x2

Reorder the terms:
-2 + 8x + 5x2 = 2 + -2 + -8x + 8x + -5x2 + 5x2

Combine like terms: 2 + -2 = 0
-2 + 8x + 5x2 = 0 + -8x + 8x + -5x2 + 5x2
-2 + 8x + 5x2 = -8x + 8x + -5x2 + 5x2

Combine like terms: -8x + 8x = 0
-2 + 8x + 5x2 = 0 + -5x2 + 5x2
-2 + 8x + 5x2 = -5x2 + 5x2

Combine like terms: -5x2 + 5x2 = 0
-2 + 8x + 5x2 = 0

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

Divide each side by '5'.
-0.4 + 1.6x + x2 = 0

Move the constant term to the right:

Add '0.4' to each side of the equation.
-0.4 + 1.6x + 0.4 + x2 = 0 + 0.4

Reorder the terms:
-0.4 + 0.4 + 1.6x + x2 = 0 + 0.4

Combine like terms: -0.4 + 0.4 = 0.0
0.0 + 1.6x + x2 = 0 + 0.4
1.6x + x2 = 0 + 0.4

Combine like terms: 0 + 0.4 = 0.4
1.6x + x2 = 0.4

The x term is 1.6x.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6x + 0.64 + x2 = 0.4 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = 0.4 + 0.64

Combine like terms: 0.4 + 0.64 = 1.04
0.64 + 1.6x + x2 = 1.04

Factor a perfect square on the left side:
(x + 0.8)(x + 0.8) = 1.04

Calculate the square root of the right side: 1.019803903

Break this problem into two subproblems by setting 
(x + 0.8) equal to 1.019803903 and -1.019803903.

Subproblem 1

x + 0.8 = 1.019803903 Simplifying x + 0.8 = 1.019803903 Reorder the terms: 0.8 + x = 1.019803903 Solving 0.8 + x = 1.019803903 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = 1.019803903 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = 1.019803903 + -0.8 x = 1.019803903 + -0.8 Combine like terms: 1.019803903 + -0.8 = 0.219803903 x = 0.219803903 Simplifying x = 0.219803903

Subproblem 2

x + 0.8 = -1.019803903 Simplifying x + 0.8 = -1.019803903 Reorder the terms: 0.8 + x = -1.019803903 Solving 0.8 + x = -1.019803903 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = -1.019803903 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = -1.019803903 + -0.8 x = -1.019803903 + -0.8 Combine like terms: -1.019803903 + -0.8 = -1.819803903 x = -1.819803903 Simplifying x = -1.819803903

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.219803903, -1.819803903}

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