x^2+12x+72=43

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Solution for x^2+12x+72=43 equation:


Simplifying
x2 + 12x + 72 = 43

Reorder the terms:
72 + 12x + x2 = 43

Solving
72 + 12x + x2 = 43

Solving for variable 'x'.

Reorder the terms:
72 + -43 + 12x + x2 = 43 + -43

Combine like terms: 72 + -43 = 29
29 + 12x + x2 = 43 + -43

Combine like terms: 43 + -43 = 0
29 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-29' to each side of the equation.
29 + 12x + -29 + x2 = 0 + -29

Reorder the terms:
29 + -29 + 12x + x2 = 0 + -29

Combine like terms: 29 + -29 = 0
0 + 12x + x2 = 0 + -29
12x + x2 = 0 + -29

Combine like terms: 0 + -29 = -29
12x + x2 = -29

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 = -29 + 36

Reorder the terms:
36 + 12x + x2 = -29 + 36

Combine like terms: -29 + 36 = 7
36 + 12x + x2 = 7

Factor a perfect square on the left side:
(x + 6)(x + 6) = 7

Calculate the square root of the right side: 2.645751311

Break this problem into two subproblems by setting 
(x + 6) equal to 2.645751311 and -2.645751311.

Subproblem 1

x + 6 = 2.645751311 Simplifying x + 6 = 2.645751311 Reorder the terms: 6 + x = 2.645751311 Solving 6 + x = 2.645751311 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 = 2.645751311 + -6 Combine like terms: 6 + -6 = 0 0 + x = 2.645751311 + -6 x = 2.645751311 + -6 Combine like terms: 2.645751311 + -6 = -3.354248689 x = -3.354248689 Simplifying x = -3.354248689

Subproblem 2

x + 6 = -2.645751311 Simplifying x + 6 = -2.645751311 Reorder the terms: 6 + x = -2.645751311 Solving 6 + x = -2.645751311 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 = -2.645751311 + -6 Combine like terms: 6 + -6 = 0 0 + x = -2.645751311 + -6 x = -2.645751311 + -6 Combine like terms: -2.645751311 + -6 = -8.645751311 x = -8.645751311 Simplifying x = -8.645751311

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-3.354248689, -8.645751311}

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