x^2+4x+12=39

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Solution for x^2+4x+12=39 equation:


Simplifying
x2 + 4x + 12 = 39

Reorder the terms:
12 + 4x + x2 = 39

Solving
12 + 4x + x2 = 39

Solving for variable 'x'.

Reorder the terms:
12 + -39 + 4x + x2 = 39 + -39

Combine like terms: 12 + -39 = -27
-27 + 4x + x2 = 39 + -39

Combine like terms: 39 + -39 = 0
-27 + 4x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + 4x + 27 + x2 = 0 + 27

Reorder the terms:
-27 + 27 + 4x + x2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + 4x + x2 = 0 + 27
4x + x2 = 0 + 27

Combine like terms: 0 + 27 = 27
4x + x2 = 27

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 27 + 4

Reorder the terms:
4 + 4x + x2 = 27 + 4

Combine like terms: 27 + 4 = 31
4 + 4x + x2 = 31

Factor a perfect square on the left side:
(x + 2)(x + 2) = 31

Calculate the square root of the right side: 5.567764363

Break this problem into two subproblems by setting 
(x + 2) equal to 5.567764363 and -5.567764363.

Subproblem 1

x + 2 = 5.567764363 Simplifying x + 2 = 5.567764363 Reorder the terms: 2 + x = 5.567764363 Solving 2 + x = 5.567764363 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 5.567764363 + -2 Combine like terms: 2 + -2 = 0 0 + x = 5.567764363 + -2 x = 5.567764363 + -2 Combine like terms: 5.567764363 + -2 = 3.567764363 x = 3.567764363 Simplifying x = 3.567764363

Subproblem 2

x + 2 = -5.567764363 Simplifying x + 2 = -5.567764363 Reorder the terms: 2 + x = -5.567764363 Solving 2 + x = -5.567764363 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -5.567764363 + -2 Combine like terms: 2 + -2 = 0 0 + x = -5.567764363 + -2 x = -5.567764363 + -2 Combine like terms: -5.567764363 + -2 = -7.567764363 x = -7.567764363 Simplifying x = -7.567764363

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.567764363, -7.567764363}

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