-x^2+800x-2500=0

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Solution for -x^2+800x-2500=0 equation:


Simplifying
-1x2 + 800x + -2500 = 0

Reorder the terms:
-2500 + 800x + -1x2 = 0

Solving
-2500 + 800x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
2500 + -800x + x2 = 0

Move the constant term to the right:

Add '-2500' to each side of the equation.
2500 + -800x + -2500 + x2 = 0 + -2500

Reorder the terms:
2500 + -2500 + -800x + x2 = 0 + -2500

Combine like terms: 2500 + -2500 = 0
0 + -800x + x2 = 0 + -2500
-800x + x2 = 0 + -2500

Combine like terms: 0 + -2500 = -2500
-800x + x2 = -2500

The x term is -800x.  Take half its coefficient (-400).
Square it (160000) and add it to both sides.

Add '160000' to each side of the equation.
-800x + 160000 + x2 = -2500 + 160000

Reorder the terms:
160000 + -800x + x2 = -2500 + 160000

Combine like terms: -2500 + 160000 = 157500
160000 + -800x + x2 = 157500

Factor a perfect square on the left side:
(x + -400)(x + -400) = 157500

Calculate the square root of the right side: 396.86269666

Break this problem into two subproblems by setting 
(x + -400) equal to 396.86269666 and -396.86269666.

Subproblem 1

x + -400 = 396.86269666 Simplifying x + -400 = 396.86269666 Reorder the terms: -400 + x = 396.86269666 Solving -400 + x = 396.86269666 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '400' to each side of the equation. -400 + 400 + x = 396.86269666 + 400 Combine like terms: -400 + 400 = 0 0 + x = 396.86269666 + 400 x = 396.86269666 + 400 Combine like terms: 396.86269666 + 400 = 796.86269666 x = 796.86269666 Simplifying x = 796.86269666

Subproblem 2

x + -400 = -396.86269666 Simplifying x + -400 = -396.86269666 Reorder the terms: -400 + x = -396.86269666 Solving -400 + x = -396.86269666 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '400' to each side of the equation. -400 + 400 + x = -396.86269666 + 400 Combine like terms: -400 + 400 = 0 0 + x = -396.86269666 + 400 x = -396.86269666 + 400 Combine like terms: -396.86269666 + 400 = 3.13730334 x = 3.13730334 Simplifying x = 3.13730334

Solution

The solution to the problem is based on the solutions from the subproblems. x = {796.86269666, 3.13730334}

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