x^2-25x-16=0

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Solution for x^2-25x-16=0 equation: 


Simplifying
x2 + -25x + -16 = 0

Reorder the terms:
-16 + -25x + x2 = 0

Solving
-16 + -25x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -25x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + -25x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -25x + x2 = 0 + 16
-25x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
-25x + x2 = 16

The x term is -25x.  Take half its coefficient (-12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
-25x + 156.25 + x2 = 16 + 156.25

Reorder the terms:
156.25 + -25x + x2 = 16 + 156.25

Combine like terms: 16 + 156.25 = 172.25
156.25 + -25x + x2 = 172.25

Factor a perfect square on the left side:
(x + -12.5)(x + -12.5) = 172.25

Calculate the square root of the right side: 13.124404748

Break this problem into two subproblems by setting 
(x + -12.5) equal to 13.124404748 and -13.124404748.


Subproblem 1
x + -12.5 = 13.124404748

Simplifying
x + -12.5 = 13.124404748

Reorder the terms:
-12.5 + x = 13.124404748

Solving
-12.5 + x = 13.124404748

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '12.5' to each side of the equation.
-12.5 + 12.5 + x = 13.124404748 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + x = 13.124404748 + 12.5
x = 13.124404748 + 12.5

Combine like terms: 13.124404748 + 12.5 = 25.624404748
x = 25.624404748

Simplifying
x = 25.624404748


Subproblem 2
x + -12.5 = -13.124404748

Simplifying
x + -12.5 = -13.124404748

Reorder the terms:
-12.5 + x = -13.124404748

Solving
-12.5 + x = -13.124404748

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '12.5' to each side of the equation.
-12.5 + 12.5 + x = -13.124404748 + 12.5

Combine like terms: -12.5 + 12.5 = 0.0
0.0 + x = -13.124404748 + 12.5
x = -13.124404748 + 12.5

Combine like terms: -13.124404748 + 12.5 = -0.624404748
x = -0.624404748

Simplifying
x = -0.624404748


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {25.624404748, -0.624404748}

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