0.64x^2-8x-7000=0

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Solution for 0.64x^2-8x-7000=0 equation:


Simplifying
0.64x2 + -8x + -7000 = 0

Reorder the terms:
-7000 + -8x + 0.64x2 = 0

Solving
-7000 + -8x + 0.64x2 = 0

Solving for variable 'x'.

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

Divide each side by '0.64'.
-10937.5 + -12.5x + x2 = 0

Move the constant term to the right:

Add '10937.5' to each side of the equation.
-10937.5 + -12.5x + 10937.5 + x2 = 0 + 10937.5

Reorder the terms:
-10937.5 + 10937.5 + -12.5x + x2 = 0 + 10937.5

Combine like terms: -10937.5 + 10937.5 = 0.0
0.0 + -12.5x + x2 = 0 + 10937.5
-12.5x + x2 = 0 + 10937.5

Combine like terms: 0 + 10937.5 = 10937.5
-12.5x + x2 = 10937.5

The x term is -12.5x.  Take half its coefficient (-6.25).
Square it (39.0625) and add it to both sides.

Add '39.0625' to each side of the equation.
-12.5x + 39.0625 + x2 = 10937.5 + 39.0625

Reorder the terms:
39.0625 + -12.5x + x2 = 10937.5 + 39.0625

Combine like terms: 10937.5 + 39.0625 = 10976.5625
39.0625 + -12.5x + x2 = 10976.5625

Factor a perfect square on the left side:
(x + -6.25)(x + -6.25) = 10976.5625

Calculate the square root of the right side: 104.769091339

Break this problem into two subproblems by setting 
(x + -6.25) equal to 104.769091339 and -104.769091339.

Subproblem 1

x + -6.25 = 104.769091339 Simplifying x + -6.25 = 104.769091339 Reorder the terms: -6.25 + x = 104.769091339 Solving -6.25 + x = 104.769091339 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.25' to each side of the equation. -6.25 + 6.25 + x = 104.769091339 + 6.25 Combine like terms: -6.25 + 6.25 = 0.00 0.00 + x = 104.769091339 + 6.25 x = 104.769091339 + 6.25 Combine like terms: 104.769091339 + 6.25 = 111.019091339 x = 111.019091339 Simplifying x = 111.019091339

Subproblem 2

x + -6.25 = -104.769091339 Simplifying x + -6.25 = -104.769091339 Reorder the terms: -6.25 + x = -104.769091339 Solving -6.25 + x = -104.769091339 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.25' to each side of the equation. -6.25 + 6.25 + x = -104.769091339 + 6.25 Combine like terms: -6.25 + 6.25 = 0.00 0.00 + x = -104.769091339 + 6.25 x = -104.769091339 + 6.25 Combine like terms: -104.769091339 + 6.25 = -98.519091339 x = -98.519091339 Simplifying x = -98.519091339

Solution

The solution to the problem is based on the solutions from the subproblems. x = {111.019091339, -98.519091339}

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