.0006x^2-.84x+.8=0

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Solution for .0006x^2-.84x+.8=0 equation:


Simplifying
0.0006x2 + -0.84x + 0.8 = 0

Reorder the terms:
0.8 + -0.84x + 0.0006x2 = 0

Solving
0.8 + -0.84x + 0.0006x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
0.0006 the coefficient of the squared term: 

Divide each side by '0.0006'.
1333.333333 + -1400x + x2 = 0

Move the constant term to the right:

Add '-1333.333333' to each side of the equation.
1333.333333 + -1400x + -1333.333333 + x2 = 0 + -1333.333333

Reorder the terms:
1333.333333 + -1333.333333 + -1400x + x2 = 0 + -1333.333333

Combine like terms: 1333.333333 + -1333.333333 = 0.000000
0.000000 + -1400x + x2 = 0 + -1333.333333
-1400x + x2 = 0 + -1333.333333

Combine like terms: 0 + -1333.333333 = -1333.333333
-1400x + x2 = -1333.333333

The x term is -1400x.  Take half its coefficient (-700).
Square it (490000) and add it to both sides.

Add '490000' to each side of the equation.
-1400x + 490000 + x2 = -1333.333333 + 490000

Reorder the terms:
490000 + -1400x + x2 = -1333.333333 + 490000

Combine like terms: -1333.333333 + 490000 = 488666.666667
490000 + -1400x + x2 = 488666.666667

Factor a perfect square on the left side:
(x + -700)(x + -700) = 488666.666667

Calculate the square root of the right side: 699.046970287

Break this problem into two subproblems by setting 
(x + -700) equal to 699.046970287 and -699.046970287.

Subproblem 1

x + -700 = 699.046970287 Simplifying x + -700 = 699.046970287 Reorder the terms: -700 + x = 699.046970287 Solving -700 + x = 699.046970287 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '700' to each side of the equation. -700 + 700 + x = 699.046970287 + 700 Combine like terms: -700 + 700 = 0 0 + x = 699.046970287 + 700 x = 699.046970287 + 700 Combine like terms: 699.046970287 + 700 = 1399.046970287 x = 1399.046970287 Simplifying x = 1399.046970287

Subproblem 2

x + -700 = -699.046970287 Simplifying x + -700 = -699.046970287 Reorder the terms: -700 + x = -699.046970287 Solving -700 + x = -699.046970287 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '700' to each side of the equation. -700 + 700 + x = -699.046970287 + 700 Combine like terms: -700 + 700 = 0 0 + x = -699.046970287 + 700 x = -699.046970287 + 700 Combine like terms: -699.046970287 + 700 = 0.953029713 x = 0.953029713 Simplifying x = 0.953029713

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1399.046970287, 0.953029713}

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