.25x^2-.08x-.83=0

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Solution for .25x^2-.08x-.83=0 equation:


Simplifying
0.25x2 + -0.08x + -0.83 = 0

Reorder the terms:
-0.83 + -0.08x + 0.25x2 = 0

Solving
-0.83 + -0.08x + 0.25x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.25'.
-3.32 + -0.32x + x2 = 0

Move the constant term to the right:

Add '3.32' to each side of the equation.
-3.32 + -0.32x + 3.32 + x2 = 0 + 3.32

Reorder the terms:
-3.32 + 3.32 + -0.32x + x2 = 0 + 3.32

Combine like terms: -3.32 + 3.32 = 0.00
0.00 + -0.32x + x2 = 0 + 3.32
-0.32x + x2 = 0 + 3.32

Combine like terms: 0 + 3.32 = 3.32
-0.32x + x2 = 3.32

The x term is -0.32x.  Take half its coefficient (-0.16).
Square it (0.0256) and add it to both sides.

Add '0.0256' to each side of the equation.
-0.32x + 0.0256 + x2 = 3.32 + 0.0256

Reorder the terms:
0.0256 + -0.32x + x2 = 3.32 + 0.0256

Combine like terms: 3.32 + 0.0256 = 3.3456
0.0256 + -0.32x + x2 = 3.3456

Factor a perfect square on the left side:
(x + -0.16)(x + -0.16) = 3.3456

Calculate the square root of the right side: 1.829098138

Break this problem into two subproblems by setting 
(x + -0.16) equal to 1.829098138 and -1.829098138.

Subproblem 1

x + -0.16 = 1.829098138 Simplifying x + -0.16 = 1.829098138 Reorder the terms: -0.16 + x = 1.829098138 Solving -0.16 + x = 1.829098138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.16' to each side of the equation. -0.16 + 0.16 + x = 1.829098138 + 0.16 Combine like terms: -0.16 + 0.16 = 0.00 0.00 + x = 1.829098138 + 0.16 x = 1.829098138 + 0.16 Combine like terms: 1.829098138 + 0.16 = 1.989098138 x = 1.989098138 Simplifying x = 1.989098138

Subproblem 2

x + -0.16 = -1.829098138 Simplifying x + -0.16 = -1.829098138 Reorder the terms: -0.16 + x = -1.829098138 Solving -0.16 + x = -1.829098138 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.16' to each side of the equation. -0.16 + 0.16 + x = -1.829098138 + 0.16 Combine like terms: -0.16 + 0.16 = 0.00 0.00 + x = -1.829098138 + 0.16 x = -1.829098138 + 0.16 Combine like terms: -1.829098138 + 0.16 = -1.669098138 x = -1.669098138 Simplifying x = -1.669098138

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.989098138, -1.669098138}

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