x^2+12x=136

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Solution for x^2+12x=136 equation:


Simplifying
x2 + 12x = 136

Reorder the terms:
12x + x2 = 136

Solving
12x + x2 = 136

Solving for variable 'x'.

Reorder the terms:
-136 + 12x + x2 = 136 + -136

Combine like terms: 136 + -136 = 0
-136 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '136' to each side of the equation.
-136 + 12x + 136 + x2 = 0 + 136

Reorder the terms:
-136 + 136 + 12x + x2 = 0 + 136

Combine like terms: -136 + 136 = 0
0 + 12x + x2 = 0 + 136
12x + x2 = 0 + 136

Combine like terms: 0 + 136 = 136
12x + x2 = 136

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 = 136 + 36

Reorder the terms:
36 + 12x + x2 = 136 + 36

Combine like terms: 136 + 36 = 172
36 + 12x + x2 = 172

Factor a perfect square on the left side:
(x + 6)(x + 6) = 172

Calculate the square root of the right side: 13.114877049

Break this problem into two subproblems by setting 
(x + 6) equal to 13.114877049 and -13.114877049.

Subproblem 1

x + 6 = 13.114877049 Simplifying x + 6 = 13.114877049 Reorder the terms: 6 + x = 13.114877049 Solving 6 + x = 13.114877049 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 = 13.114877049 + -6 Combine like terms: 6 + -6 = 0 0 + x = 13.114877049 + -6 x = 13.114877049 + -6 Combine like terms: 13.114877049 + -6 = 7.114877049 x = 7.114877049 Simplifying x = 7.114877049

Subproblem 2

x + 6 = -13.114877049 Simplifying x + 6 = -13.114877049 Reorder the terms: 6 + x = -13.114877049 Solving 6 + x = -13.114877049 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 = -13.114877049 + -6 Combine like terms: 6 + -6 = 0 0 + x = -13.114877049 + -6 x = -13.114877049 + -6 Combine like terms: -13.114877049 + -6 = -19.114877049 x = -19.114877049 Simplifying x = -19.114877049

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.114877049, -19.114877049}

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