1000-x=800(x^2)

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Solution for 1000-x=800(x^2) equation:


Simplifying
1000 + -1x = 800(x2)

Solving
1000 + -1x = 800x2

Solving for variable 'x'.

Combine like terms: 800x2 + -800x2 = 0
1000 + -1x + -800x2 = 0

Begin completing the square.  Divide all terms by
-800 the coefficient of the squared term: 

Divide each side by '-800'.
-1.25 + 0.00125x + x2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + 0.00125x + 1.25 + x2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + 0.00125x + x2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + 0.00125x + x2 = 0 + 1.25
0.00125x + x2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
0.00125x + x2 = 1.25

The x term is 0.00125x.  Take half its coefficient (0.000625).
Square it (0.000000390625) and add it to both sides.

Add '0.000000390625' to each side of the equation.
0.00125x + 0.000000390625 + x2 = 1.25 + 0.000000390625

Reorder the terms:
0.000000390625 + 0.00125x + x2 = 1.25 + 0.000000390625

Combine like terms: 1.25 + 0.000000390625 = 1.250000390625
0.000000390625 + 0.00125x + x2 = 1.250000390625

Factor a perfect square on the left side:
(x + 0.000625)(x + 0.000625) = 1.250000390625

Calculate the square root of the right side: 1.118034163

Break this problem into two subproblems by setting 
(x + 0.000625) equal to 1.118034163 and -1.118034163.

Subproblem 1

x + 0.000625 = 1.118034163 Simplifying x + 0.000625 = 1.118034163 Reorder the terms: 0.000625 + x = 1.118034163 Solving 0.000625 + x = 1.118034163 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.000625' to each side of the equation. 0.000625 + -0.000625 + x = 1.118034163 + -0.000625 Combine like terms: 0.000625 + -0.000625 = 0.000000 0.000000 + x = 1.118034163 + -0.000625 x = 1.118034163 + -0.000625 Combine like terms: 1.118034163 + -0.000625 = 1.117409163 x = 1.117409163 Simplifying x = 1.117409163

Subproblem 2

x + 0.000625 = -1.118034163 Simplifying x + 0.000625 = -1.118034163 Reorder the terms: 0.000625 + x = -1.118034163 Solving 0.000625 + x = -1.118034163 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.000625' to each side of the equation. 0.000625 + -0.000625 + x = -1.118034163 + -0.000625 Combine like terms: 0.000625 + -0.000625 = 0.000000 0.000000 + x = -1.118034163 + -0.000625 x = -1.118034163 + -0.000625 Combine like terms: -1.118034163 + -0.000625 = -1.118659163 x = -1.118659163 Simplifying x = -1.118659163

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.117409163, -1.118659163}

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