x^2-25x-12=0

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Solution for x^2-25x-12=0 equation:


Simplifying
x2 + -25x + -12 = 0

Reorder the terms:
-12 + -25x + x2 = 0

Solving
-12 + -25x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -25x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -25x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -25x + x2 = 0 + 12
-25x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-25x + x2 = 12

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 = 12 + 156.25

Reorder the terms:
156.25 + -25x + x2 = 12 + 156.25

Combine like terms: 12 + 156.25 = 168.25
156.25 + -25x + x2 = 168.25

Factor a perfect square on the left side:
(x + -12.5)(x + -12.5) = 168.25

Calculate the square root of the right side: 12.971121771

Break this problem into two subproblems by setting 
(x + -12.5) equal to 12.971121771 and -12.971121771.

Subproblem 1

x + -12.5 = 12.971121771 Simplifying x + -12.5 = 12.971121771 Reorder the terms: -12.5 + x = 12.971121771 Solving -12.5 + x = 12.971121771 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 = 12.971121771 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = 12.971121771 + 12.5 x = 12.971121771 + 12.5 Combine like terms: 12.971121771 + 12.5 = 25.471121771 x = 25.471121771 Simplifying x = 25.471121771

Subproblem 2

x + -12.5 = -12.971121771 Simplifying x + -12.5 = -12.971121771 Reorder the terms: -12.5 + x = -12.971121771 Solving -12.5 + x = -12.971121771 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 = -12.971121771 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + x = -12.971121771 + 12.5 x = -12.971121771 + 12.5 Combine like terms: -12.971121771 + 12.5 = -0.471121771 x = -0.471121771 Simplifying x = -0.471121771

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.471121771, -0.471121771}

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