x^2+2x+12=180-x

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Solution for x^2+2x+12=180-x equation:


Simplifying
x2 + 2x + 12 = 180 + -1x

Reorder the terms:
12 + 2x + x2 = 180 + -1x

Solving
12 + 2x + x2 = 180 + -1x

Solving for variable 'x'.

Reorder the terms:
12 + -180 + 2x + x + x2 = 180 + -1x + -180 + x

Combine like terms: 12 + -180 = -168
-168 + 2x + x + x2 = 180 + -1x + -180 + x

Combine like terms: 2x + x = 3x
-168 + 3x + x2 = 180 + -1x + -180 + x

Reorder the terms:
-168 + 3x + x2 = 180 + -180 + -1x + x

Combine like terms: 180 + -180 = 0
-168 + 3x + x2 = 0 + -1x + x
-168 + 3x + x2 = -1x + x

Combine like terms: -1x + x = 0
-168 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '168' to each side of the equation.
-168 + 3x + 168 + x2 = 0 + 168

Reorder the terms:
-168 + 168 + 3x + x2 = 0 + 168

Combine like terms: -168 + 168 = 0
0 + 3x + x2 = 0 + 168
3x + x2 = 0 + 168

Combine like terms: 0 + 168 = 168
3x + x2 = 168

The x term is 3x.  Take half its coefficient (1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
3x + 2.25 + x2 = 168 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 168 + 2.25

Combine like terms: 168 + 2.25 = 170.25
2.25 + 3x + x2 = 170.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 170.25

Calculate the square root of the right side: 13.047988351

Break this problem into two subproblems by setting 
(x + 1.5) equal to 13.047988351 and -13.047988351.

Subproblem 1

x + 1.5 = 13.047988351 Simplifying x + 1.5 = 13.047988351 Reorder the terms: 1.5 + x = 13.047988351 Solving 1.5 + x = 13.047988351 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = 13.047988351 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 13.047988351 + -1.5 x = 13.047988351 + -1.5 Combine like terms: 13.047988351 + -1.5 = 11.547988351 x = 11.547988351 Simplifying x = 11.547988351

Subproblem 2

x + 1.5 = -13.047988351 Simplifying x + 1.5 = -13.047988351 Reorder the terms: 1.5 + x = -13.047988351 Solving 1.5 + x = -13.047988351 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.5' to each side of the equation. 1.5 + -1.5 + x = -13.047988351 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -13.047988351 + -1.5 x = -13.047988351 + -1.5 Combine like terms: -13.047988351 + -1.5 = -14.547988351 x = -14.547988351 Simplifying x = -14.547988351

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.547988351, -14.547988351}

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