x^2+12x-289=0

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Solution for x^2+12x-289=0 equation:


Simplifying
x2 + 12x + -289 = 0

Reorder the terms:
-289 + 12x + x2 = 0

Solving
-289 + 12x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '289' to each side of the equation.
-289 + 12x + 289 + x2 = 0 + 289

Reorder the terms:
-289 + 289 + 12x + x2 = 0 + 289

Combine like terms: -289 + 289 = 0
0 + 12x + x2 = 0 + 289
12x + x2 = 0 + 289

Combine like terms: 0 + 289 = 289
12x + x2 = 289

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 = 289 + 36

Reorder the terms:
36 + 12x + x2 = 289 + 36

Combine like terms: 289 + 36 = 325
36 + 12x + x2 = 325

Factor a perfect square on the left side:
(x + 6)(x + 6) = 325

Calculate the square root of the right side: 18.027756377

Break this problem into two subproblems by setting 
(x + 6) equal to 18.027756377 and -18.027756377.

Subproblem 1

x + 6 = 18.027756377 Simplifying x + 6 = 18.027756377 Reorder the terms: 6 + x = 18.027756377 Solving 6 + x = 18.027756377 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 = 18.027756377 + -6 Combine like terms: 6 + -6 = 0 0 + x = 18.027756377 + -6 x = 18.027756377 + -6 Combine like terms: 18.027756377 + -6 = 12.027756377 x = 12.027756377 Simplifying x = 12.027756377

Subproblem 2

x + 6 = -18.027756377 Simplifying x + 6 = -18.027756377 Reorder the terms: 6 + x = -18.027756377 Solving 6 + x = -18.027756377 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 = -18.027756377 + -6 Combine like terms: 6 + -6 = 0 0 + x = -18.027756377 + -6 x = -18.027756377 + -6 Combine like terms: -18.027756377 + -6 = -24.027756377 x = -24.027756377 Simplifying x = -24.027756377

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.027756377, -24.027756377}

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