x^2-25x-100=0

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Solution for x^2-25x-100=0 equation:


Simplifying
x2 + -25x + -100 = 0

Reorder the terms:
-100 + -25x + x2 = 0

Solving
-100 + -25x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + -25x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + -25x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + -25x + x2 = 0 + 100
-25x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
-25x + x2 = 100

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 = 100 + 156.25

Reorder the terms:
156.25 + -25x + x2 = 100 + 156.25

Combine like terms: 100 + 156.25 = 256.25
156.25 + -25x + x2 = 256.25

Factor a perfect square on the left side:
(x + -12.5)(x + -12.5) = 256.25

Calculate the square root of the right side: 16.007810594

Break this problem into two subproblems by setting 
(x + -12.5) equal to 16.007810594 and -16.007810594.

Subproblem 1

x + -12.5 = 16.007810594 Simplifying x + -12.5 = 16.007810594 Reorder the terms: -12.5 + x = 16.007810594 Solving -12.5 + x = 16.007810594 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 = 16.007810594 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = 16.007810594 + 12.5 x = 16.007810594 + 12.5 Combine like terms: 16.007810594 + 12.5 = 28.507810594 x = 28.507810594 Simplifying x = 28.507810594

Subproblem 2

x + -12.5 = -16.007810594 Simplifying x + -12.5 = -16.007810594 Reorder the terms: -12.5 + x = -16.007810594 Solving -12.5 + x = -16.007810594 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 = -16.007810594 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = -16.007810594 + 12.5 x = -16.007810594 + 12.5 Combine like terms: -16.007810594 + 12.5 = -3.507810594 x = -3.507810594 Simplifying x = -3.507810594

Solution

The solution to the problem is based on the solutions from the subproblems. x = {28.507810594, -3.507810594}

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