x^2-80x+25=0

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Solution for x^2-80x+25=0 equation:


Simplifying
x2 + -80x + 25 = 0

Reorder the terms:
25 + -80x + x2 = 0

Solving
25 + -80x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + -80x + -25 + x2 = 0 + -25

Reorder the terms:
25 + -25 + -80x + x2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + -80x + x2 = 0 + -25
-80x + x2 = 0 + -25

Combine like terms: 0 + -25 = -25
-80x + x2 = -25

The x term is -80x.  Take half its coefficient (-40).
Square it (1600) and add it to both sides.

Add '1600' to each side of the equation.
-80x + 1600 + x2 = -25 + 1600

Reorder the terms:
1600 + -80x + x2 = -25 + 1600

Combine like terms: -25 + 1600 = 1575
1600 + -80x + x2 = 1575

Factor a perfect square on the left side:
(x + -40)(x + -40) = 1575

Calculate the square root of the right side: 39.686269666

Break this problem into two subproblems by setting 
(x + -40) equal to 39.686269666 and -39.686269666.

Subproblem 1

x + -40 = 39.686269666 Simplifying x + -40 = 39.686269666 Reorder the terms: -40 + x = 39.686269666 Solving -40 + x = 39.686269666 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = 39.686269666 + 40 Combine like terms: -40 + 40 = 0 0 + x = 39.686269666 + 40 x = 39.686269666 + 40 Combine like terms: 39.686269666 + 40 = 79.686269666 x = 79.686269666 Simplifying x = 79.686269666

Subproblem 2

x + -40 = -39.686269666 Simplifying x + -40 = -39.686269666 Reorder the terms: -40 + x = -39.686269666 Solving -40 + x = -39.686269666 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '40' to each side of the equation. -40 + 40 + x = -39.686269666 + 40 Combine like terms: -40 + 40 = 0 0 + x = -39.686269666 + 40 x = -39.686269666 + 40 Combine like terms: -39.686269666 + 40 = 0.313730334 x = 0.313730334 Simplifying x = 0.313730334

Solution

The solution to the problem is based on the solutions from the subproblems. x = {79.686269666, 0.313730334}

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