x^2+12x=100

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Solution for x^2+12x=100 equation:


Simplifying
x2 + 12x = 100

Reorder the terms:
12x + x2 = 100

Solving
12x + x2 = 100

Solving for variable 'x'.

Reorder the terms:
-100 + 12x + x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 12x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + 12x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 12x + x2 = 0 + 100
12x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
12x + x2 = 100

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 = 100 + 36

Reorder the terms:
36 + 12x + x2 = 100 + 36

Combine like terms: 100 + 36 = 136
36 + 12x + x2 = 136

Factor a perfect square on the left side:
(x + 6)(x + 6) = 136

Calculate the square root of the right side: 11.66190379

Break this problem into two subproblems by setting 
(x + 6) equal to 11.66190379 and -11.66190379.

Subproblem 1

x + 6 = 11.66190379 Simplifying x + 6 = 11.66190379 Reorder the terms: 6 + x = 11.66190379 Solving 6 + x = 11.66190379 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 = 11.66190379 + -6 Combine like terms: 6 + -6 = 0 0 + x = 11.66190379 + -6 x = 11.66190379 + -6 Combine like terms: 11.66190379 + -6 = 5.66190379 x = 5.66190379 Simplifying x = 5.66190379

Subproblem 2

x + 6 = -11.66190379 Simplifying x + 6 = -11.66190379 Reorder the terms: 6 + x = -11.66190379 Solving 6 + x = -11.66190379 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 = -11.66190379 + -6 Combine like terms: 6 + -6 = 0 0 + x = -11.66190379 + -6 x = -11.66190379 + -6 Combine like terms: -11.66190379 + -6 = -17.66190379 x = -17.66190379 Simplifying x = -17.66190379

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.66190379, -17.66190379}

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