x^2+12x=257

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Solution for x^2+12x=257 equation:


Simplifying
x2 + 12x = 257

Reorder the terms:
12x + x2 = 257

Solving
12x + x2 = 257

Solving for variable 'x'.

Reorder the terms:
-257 + 12x + x2 = 257 + -257

Combine like terms: 257 + -257 = 0
-257 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '257' to each side of the equation.
-257 + 12x + 257 + x2 = 0 + 257

Reorder the terms:
-257 + 257 + 12x + x2 = 0 + 257

Combine like terms: -257 + 257 = 0
0 + 12x + x2 = 0 + 257
12x + x2 = 0 + 257

Combine like terms: 0 + 257 = 257
12x + x2 = 257

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 257 + 36

Reorder the terms:
36 + 12x + x2 = 257 + 36

Combine like terms: 257 + 36 = 293
36 + 12x + x2 = 293

Factor a perfect square on the left side:
(x + 6)(x + 6) = 293

Calculate the square root of the right side: 17.117242769

Break this problem into two subproblems by setting 
(x + 6) equal to 17.117242769 and -17.117242769.

Subproblem 1

x + 6 = 17.117242769 Simplifying x + 6 = 17.117242769 Reorder the terms: 6 + x = 17.117242769 Solving 6 + x = 17.117242769 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 17.117242769 + -6 Combine like terms: 6 + -6 = 0 0 + x = 17.117242769 + -6 x = 17.117242769 + -6 Combine like terms: 17.117242769 + -6 = 11.117242769 x = 11.117242769 Simplifying x = 11.117242769

Subproblem 2

x + 6 = -17.117242769 Simplifying x + 6 = -17.117242769 Reorder the terms: 6 + x = -17.117242769 Solving 6 + x = -17.117242769 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -17.117242769 + -6 Combine like terms: 6 + -6 = 0 0 + x = -17.117242769 + -6 x = -17.117242769 + -6 Combine like terms: -17.117242769 + -6 = -23.117242769 x = -23.117242769 Simplifying x = -23.117242769

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.117242769, -23.117242769}

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