x^2+36x=-42

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Solution for x^2+36x=-42 equation:


Simplifying
x2 + 36x = -42

Reorder the terms:
36x + x2 = -42

Solving
36x + x2 = -42

Solving for variable 'x'.

Reorder the terms:
42 + 36x + x2 = -42 + 42

Combine like terms: -42 + 42 = 0
42 + 36x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-42' to each side of the equation.
42 + 36x + -42 + x2 = 0 + -42

Reorder the terms:
42 + -42 + 36x + x2 = 0 + -42

Combine like terms: 42 + -42 = 0
0 + 36x + x2 = 0 + -42
36x + x2 = 0 + -42

Combine like terms: 0 + -42 = -42
36x + x2 = -42

The x term is 36x.  Take half its coefficient (18).
Square it (324) and add it to both sides.

Add '324' to each side of the equation.
36x + 324 + x2 = -42 + 324

Reorder the terms:
324 + 36x + x2 = -42 + 324

Combine like terms: -42 + 324 = 282
324 + 36x + x2 = 282

Factor a perfect square on the left side:
(x + 18)(x + 18) = 282

Calculate the square root of the right side: 16.792855624

Break this problem into two subproblems by setting 
(x + 18) equal to 16.792855624 and -16.792855624.

Subproblem 1

x + 18 = 16.792855624 Simplifying x + 18 = 16.792855624 Reorder the terms: 18 + x = 16.792855624 Solving 18 + x = 16.792855624 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + x = 16.792855624 + -18 Combine like terms: 18 + -18 = 0 0 + x = 16.792855624 + -18 x = 16.792855624 + -18 Combine like terms: 16.792855624 + -18 = -1.207144376 x = -1.207144376 Simplifying x = -1.207144376

Subproblem 2

x + 18 = -16.792855624 Simplifying x + 18 = -16.792855624 Reorder the terms: 18 + x = -16.792855624 Solving 18 + x = -16.792855624 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + x = -16.792855624 + -18 Combine like terms: 18 + -18 = 0 0 + x = -16.792855624 + -18 x = -16.792855624 + -18 Combine like terms: -16.792855624 + -18 = -34.792855624 x = -34.792855624 Simplifying x = -34.792855624

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.207144376, -34.792855624}

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