4x^2+8x-.08=0

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Solution for 4x^2+8x-.08=0 equation:


Simplifying
4x2 + 8x + -0.08 = 0

Reorder the terms:
-0.08 + 8x + 4x2 = 0

Solving
-0.08 + 8x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-0.02 + 2x + x2 = 0

Move the constant term to the right:

Add '0.02' to each side of the equation.
-0.02 + 2x + 0.02 + x2 = 0 + 0.02

Reorder the terms:
-0.02 + 0.02 + 2x + x2 = 0 + 0.02

Combine like terms: -0.02 + 0.02 = 0.00
0.00 + 2x + x2 = 0 + 0.02
2x + x2 = 0 + 0.02

Combine like terms: 0 + 0.02 = 0.02
2x + x2 = 0.02

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 0.02 + 1

Reorder the terms:
1 + 2x + x2 = 0.02 + 1

Combine like terms: 0.02 + 1 = 1.02
1 + 2x + x2 = 1.02

Factor a perfect square on the left side:
(x + 1)(x + 1) = 1.02

Calculate the square root of the right side: 1.009950494

Break this problem into two subproblems by setting 
(x + 1) equal to 1.009950494 and -1.009950494.

Subproblem 1

x + 1 = 1.009950494 Simplifying x + 1 = 1.009950494 Reorder the terms: 1 + x = 1.009950494 Solving 1 + x = 1.009950494 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 1.009950494 + -1 Combine like terms: 1 + -1 = 0 0 + x = 1.009950494 + -1 x = 1.009950494 + -1 Combine like terms: 1.009950494 + -1 = 0.009950494 x = 0.009950494 Simplifying x = 0.009950494

Subproblem 2

x + 1 = -1.009950494 Simplifying x + 1 = -1.009950494 Reorder the terms: 1 + x = -1.009950494 Solving 1 + x = -1.009950494 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -1.009950494 + -1 Combine like terms: 1 + -1 = 0 0 + x = -1.009950494 + -1 x = -1.009950494 + -1 Combine like terms: -1.009950494 + -1 = -2.009950494 x = -2.009950494 Simplifying x = -2.009950494

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.009950494, -2.009950494}

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