x^2+25x=258

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Solution for x^2+25x=258 equation:


Simplifying
x2 + 25x = 258

Reorder the terms:
25x + x2 = 258

Solving
25x + x2 = 258

Solving for variable 'x'.

Reorder the terms:
-258 + 25x + x2 = 258 + -258

Combine like terms: 258 + -258 = 0
-258 + 25x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '258' to each side of the equation.
-258 + 25x + 258 + x2 = 0 + 258

Reorder the terms:
-258 + 258 + 25x + x2 = 0 + 258

Combine like terms: -258 + 258 = 0
0 + 25x + x2 = 0 + 258
25x + x2 = 0 + 258

Combine like terms: 0 + 258 = 258
25x + x2 = 258

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 = 258 + 156.25

Reorder the terms:
156.25 + 25x + x2 = 258 + 156.25

Combine like terms: 258 + 156.25 = 414.25
156.25 + 25x + x2 = 414.25

Factor a perfect square on the left side:
(x + 12.5)(x + 12.5) = 414.25

Calculate the square root of the right side: 20.353132437

Break this problem into two subproblems by setting 
(x + 12.5) equal to 20.353132437 and -20.353132437.

Subproblem 1

x + 12.5 = 20.353132437 Simplifying x + 12.5 = 20.353132437 Reorder the terms: 12.5 + x = 20.353132437 Solving 12.5 + x = 20.353132437 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 = 20.353132437 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + x = 20.353132437 + -12.5 x = 20.353132437 + -12.5 Combine like terms: 20.353132437 + -12.5 = 7.853132437 x = 7.853132437 Simplifying x = 7.853132437

Subproblem 2

x + 12.5 = -20.353132437 Simplifying x + 12.5 = -20.353132437 Reorder the terms: 12.5 + x = -20.353132437 Solving 12.5 + x = -20.353132437 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 = -20.353132437 + -12.5 Combine like terms: 12.5 + -12.5 = 0.0 0.0 + x = -20.353132437 + -12.5 x = -20.353132437 + -12.5 Combine like terms: -20.353132437 + -12.5 = -32.853132437 x = -32.853132437 Simplifying x = -32.853132437

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.853132437, -32.853132437}

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