10x^2-8x+.8=0

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Solution for 10x^2-8x+.8=0 equation:


Simplifying
10x2 + -8x + 0.8 = 0

Reorder the terms:
0.8 + -8x + 10x2 = 0

Solving
0.8 + -8x + 10x2 = 0

Solving for variable 'x'.

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

Divide each side by '10'.
0.08 + -0.8x + x2 = 0

Move the constant term to the right:

Add '-0.08' to each side of the equation.
0.08 + -0.8x + -0.08 + x2 = 0 + -0.08

Reorder the terms:
0.08 + -0.08 + -0.8x + x2 = 0 + -0.08

Combine like terms: 0.08 + -0.08 = 0.00
0.00 + -0.8x + x2 = 0 + -0.08
-0.8x + x2 = 0 + -0.08

Combine like terms: 0 + -0.08 = -0.08
-0.8x + x2 = -0.08

The x term is -0.8x.  Take half its coefficient (-0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
-0.8x + 0.16 + x2 = -0.08 + 0.16

Reorder the terms:
0.16 + -0.8x + x2 = -0.08 + 0.16

Combine like terms: -0.08 + 0.16 = 0.08
0.16 + -0.8x + x2 = 0.08

Factor a perfect square on the left side:
(x + -0.4)(x + -0.4) = 0.08

Calculate the square root of the right side: 0.282842712

Break this problem into two subproblems by setting 
(x + -0.4) equal to 0.282842712 and -0.282842712.

Subproblem 1

x + -0.4 = 0.282842712 Simplifying x + -0.4 = 0.282842712 Reorder the terms: -0.4 + x = 0.282842712 Solving -0.4 + x = 0.282842712 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + x = 0.282842712 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = 0.282842712 + 0.4 x = 0.282842712 + 0.4 Combine like terms: 0.282842712 + 0.4 = 0.682842712 x = 0.682842712 Simplifying x = 0.682842712

Subproblem 2

x + -0.4 = -0.282842712 Simplifying x + -0.4 = -0.282842712 Reorder the terms: -0.4 + x = -0.282842712 Solving -0.4 + x = -0.282842712 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4' to each side of the equation. -0.4 + 0.4 + x = -0.282842712 + 0.4 Combine like terms: -0.4 + 0.4 = 0.0 0.0 + x = -0.282842712 + 0.4 x = -0.282842712 + 0.4 Combine like terms: -0.282842712 + 0.4 = 0.117157288 x = 0.117157288 Simplifying x = 0.117157288

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.682842712, 0.117157288}

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