x^2+12x+36=13

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Solution for x^2+12x+36=13 equation:


Simplifying
x2 + 12x + 36 = 13

Reorder the terms:
36 + 12x + x2 = 13

Solving
36 + 12x + x2 = 13

Solving for variable 'x'.

Reorder the terms:
36 + -13 + 12x + x2 = 13 + -13

Combine like terms: 36 + -13 = 23
23 + 12x + x2 = 13 + -13

Combine like terms: 13 + -13 = 0
23 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-23' to each side of the equation.
23 + 12x + -23 + x2 = 0 + -23

Reorder the terms:
23 + -23 + 12x + x2 = 0 + -23

Combine like terms: 23 + -23 = 0
0 + 12x + x2 = 0 + -23
12x + x2 = 0 + -23

Combine like terms: 0 + -23 = -23
12x + x2 = -23

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 = -23 + 36

Reorder the terms:
36 + 12x + x2 = -23 + 36

Combine like terms: -23 + 36 = 13
36 + 12x + x2 = 13

Factor a perfect square on the left side:
(x + 6)(x + 6) = 13

Calculate the square root of the right side: 3.605551275

Break this problem into two subproblems by setting 
(x + 6) equal to 3.605551275 and -3.605551275.

Subproblem 1

x + 6 = 3.605551275 Simplifying x + 6 = 3.605551275 Reorder the terms: 6 + x = 3.605551275 Solving 6 + x = 3.605551275 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 = 3.605551275 + -6 Combine like terms: 6 + -6 = 0 0 + x = 3.605551275 + -6 x = 3.605551275 + -6 Combine like terms: 3.605551275 + -6 = -2.394448725 x = -2.394448725 Simplifying x = -2.394448725

Subproblem 2

x + 6 = -3.605551275 Simplifying x + 6 = -3.605551275 Reorder the terms: 6 + x = -3.605551275 Solving 6 + x = -3.605551275 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 = -3.605551275 + -6 Combine like terms: 6 + -6 = 0 0 + x = -3.605551275 + -6 x = -3.605551275 + -6 Combine like terms: -3.605551275 + -6 = -9.605551275 x = -9.605551275 Simplifying x = -9.605551275

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.394448725, -9.605551275}

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