x^2-100x+800=0

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Solution for x^2-100x+800=0 equation:


Simplifying
x2 + -100x + 800 = 0

Reorder the terms:
800 + -100x + x2 = 0

Solving
800 + -100x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-800' to each side of the equation.
800 + -100x + -800 + x2 = 0 + -800

Reorder the terms:
800 + -800 + -100x + x2 = 0 + -800

Combine like terms: 800 + -800 = 0
0 + -100x + x2 = 0 + -800
-100x + x2 = 0 + -800

Combine like terms: 0 + -800 = -800
-100x + x2 = -800

The x term is -100x.  Take half its coefficient (-50).
Square it (2500) and add it to both sides.

Add '2500' to each side of the equation.
-100x + 2500 + x2 = -800 + 2500

Reorder the terms:
2500 + -100x + x2 = -800 + 2500

Combine like terms: -800 + 2500 = 1700
2500 + -100x + x2 = 1700

Factor a perfect square on the left side:
(x + -50)(x + -50) = 1700

Calculate the square root of the right side: 41.231056256

Break this problem into two subproblems by setting 
(x + -50) equal to 41.231056256 and -41.231056256.

Subproblem 1

x + -50 = 41.231056256 Simplifying x + -50 = 41.231056256 Reorder the terms: -50 + x = 41.231056256 Solving -50 + x = 41.231056256 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x = 41.231056256 + 50 Combine like terms: -50 + 50 = 0 0 + x = 41.231056256 + 50 x = 41.231056256 + 50 Combine like terms: 41.231056256 + 50 = 91.231056256 x = 91.231056256 Simplifying x = 91.231056256

Subproblem 2

x + -50 = -41.231056256 Simplifying x + -50 = -41.231056256 Reorder the terms: -50 + x = -41.231056256 Solving -50 + x = -41.231056256 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '50' to each side of the equation. -50 + 50 + x = -41.231056256 + 50 Combine like terms: -50 + 50 = 0 0 + x = -41.231056256 + 50 x = -41.231056256 + 50 Combine like terms: -41.231056256 + 50 = 8.768943744 x = 8.768943744 Simplifying x = 8.768943744

Solution

The solution to the problem is based on the solutions from the subproblems. x = {91.231056256, 8.768943744}

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