x^2+12x=72

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


Simplifying
x2 + 12x = 72

Reorder the terms:
12x + x2 = 72

Solving
12x + x2 = 72

Solving for variable 'x'.

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

Combine like terms: 72 + -72 = 0
-72 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '72' to each side of the equation.
-72 + 12x + 72 + x2 = 0 + 72

Reorder the terms:
-72 + 72 + 12x + x2 = 0 + 72

Combine like terms: -72 + 72 = 0
0 + 12x + x2 = 0 + 72
12x + x2 = 0 + 72

Combine like terms: 0 + 72 = 72
12x + x2 = 72

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 = 72 + 36

Reorder the terms:
36 + 12x + x2 = 72 + 36

Combine like terms: 72 + 36 = 108
36 + 12x + x2 = 108

Factor a perfect square on the left side:
(x + 6)(x + 6) = 108

Calculate the square root of the right side: 10.392304845

Break this problem into two subproblems by setting 
(x + 6) equal to 10.392304845 and -10.392304845.

Subproblem 1

x + 6 = 10.392304845 Simplifying x + 6 = 10.392304845 Reorder the terms: 6 + x = 10.392304845 Solving 6 + x = 10.392304845 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 = 10.392304845 + -6 Combine like terms: 6 + -6 = 0 0 + x = 10.392304845 + -6 x = 10.392304845 + -6 Combine like terms: 10.392304845 + -6 = 4.392304845 x = 4.392304845 Simplifying x = 4.392304845

Subproblem 2

x + 6 = -10.392304845 Simplifying x + 6 = -10.392304845 Reorder the terms: 6 + x = -10.392304845 Solving 6 + x = -10.392304845 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 = -10.392304845 + -6 Combine like terms: 6 + -6 = 0 0 + x = -10.392304845 + -6 x = -10.392304845 + -6 Combine like terms: -10.392304845 + -6 = -16.392304845 x = -16.392304845 Simplifying x = -16.392304845

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.392304845, -16.392304845}

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