x^2-25x-4=0

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Solution for x^2-25x-4=0 equation:


Simplifying
x2 + -25x + -4 = 0

Reorder the terms:
-4 + -25x + x2 = 0

Solving
-4 + -25x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -25x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + -25x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -25x + x2 = 0 + 4
-25x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
-25x + x2 = 4

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 = 4 + 156.25

Reorder the terms:
156.25 + -25x + x2 = 4 + 156.25

Combine like terms: 4 + 156.25 = 160.25
156.25 + -25x + x2 = 160.25

Factor a perfect square on the left side:
(x + -12.5)(x + -12.5) = 160.25

Calculate the square root of the right side: 12.658988901

Break this problem into two subproblems by setting 
(x + -12.5) equal to 12.658988901 and -12.658988901.

Subproblem 1

x + -12.5 = 12.658988901 Simplifying x + -12.5 = 12.658988901 Reorder the terms: -12.5 + x = 12.658988901 Solving -12.5 + x = 12.658988901 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 = 12.658988901 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = 12.658988901 + 12.5 x = 12.658988901 + 12.5 Combine like terms: 12.658988901 + 12.5 = 25.158988901 x = 25.158988901 Simplifying x = 25.158988901

Subproblem 2

x + -12.5 = -12.658988901 Simplifying x + -12.5 = -12.658988901 Reorder the terms: -12.5 + x = -12.658988901 Solving -12.5 + x = -12.658988901 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 = -12.658988901 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = -12.658988901 + 12.5 x = -12.658988901 + 12.5 Combine like terms: -12.658988901 + 12.5 = -0.158988901 x = -0.158988901 Simplifying x = -0.158988901

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.158988901, -0.158988901}

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