x^2+12x=331

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Solution for x^2+12x=331 equation:


Simplifying
x2 + 12x = 331

Reorder the terms:
12x + x2 = 331

Solving
12x + x2 = 331

Solving for variable 'x'.

Reorder the terms:
-331 + 12x + x2 = 331 + -331

Combine like terms: 331 + -331 = 0
-331 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '331' to each side of the equation.
-331 + 12x + 331 + x2 = 0 + 331

Reorder the terms:
-331 + 331 + 12x + x2 = 0 + 331

Combine like terms: -331 + 331 = 0
0 + 12x + x2 = 0 + 331
12x + x2 = 0 + 331

Combine like terms: 0 + 331 = 331
12x + x2 = 331

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 = 331 + 36

Reorder the terms:
36 + 12x + x2 = 331 + 36

Combine like terms: 331 + 36 = 367
36 + 12x + x2 = 367

Factor a perfect square on the left side:
(x + 6)(x + 6) = 367

Calculate the square root of the right side: 19.157244061

Break this problem into two subproblems by setting 
(x + 6) equal to 19.157244061 and -19.157244061.

Subproblem 1

x + 6 = 19.157244061 Simplifying x + 6 = 19.157244061 Reorder the terms: 6 + x = 19.157244061 Solving 6 + x = 19.157244061 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 = 19.157244061 + -6 Combine like terms: 6 + -6 = 0 0 + x = 19.157244061 + -6 x = 19.157244061 + -6 Combine like terms: 19.157244061 + -6 = 13.157244061 x = 13.157244061 Simplifying x = 13.157244061

Subproblem 2

x + 6 = -19.157244061 Simplifying x + 6 = -19.157244061 Reorder the terms: 6 + x = -19.157244061 Solving 6 + x = -19.157244061 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 = -19.157244061 + -6 Combine like terms: 6 + -6 = 0 0 + x = -19.157244061 + -6 x = -19.157244061 + -6 Combine like terms: -19.157244061 + -6 = -25.157244061 x = -25.157244061 Simplifying x = -25.157244061

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.157244061, -25.157244061}

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