x^2+3x-12=180

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Solution for x^2+3x-12=180 equation:


Simplifying
x2 + 3x + -12 = 180

Reorder the terms:
-12 + 3x + x2 = 180

Solving
-12 + 3x + x2 = 180

Solving for variable 'x'.

Reorder the terms:
-12 + -180 + 3x + x2 = 180 + -180

Combine like terms: -12 + -180 = -192
-192 + 3x + x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-192 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '192' to each side of the equation.
-192 + 3x + 192 + x2 = 0 + 192

Reorder the terms:
-192 + 192 + 3x + x2 = 0 + 192

Combine like terms: -192 + 192 = 0
0 + 3x + x2 = 0 + 192
3x + x2 = 0 + 192

Combine like terms: 0 + 192 = 192
3x + x2 = 192

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 = 192 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 192 + 2.25

Combine like terms: 192 + 2.25 = 194.25
2.25 + 3x + x2 = 194.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 194.25

Calculate the square root of the right side: 13.937359865

Break this problem into two subproblems by setting 
(x + 1.5) equal to 13.937359865 and -13.937359865.

Subproblem 1

x + 1.5 = 13.937359865 Simplifying x + 1.5 = 13.937359865 Reorder the terms: 1.5 + x = 13.937359865 Solving 1.5 + x = 13.937359865 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 = 13.937359865 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 13.937359865 + -1.5 x = 13.937359865 + -1.5 Combine like terms: 13.937359865 + -1.5 = 12.437359865 x = 12.437359865 Simplifying x = 12.437359865

Subproblem 2

x + 1.5 = -13.937359865 Simplifying x + 1.5 = -13.937359865 Reorder the terms: 1.5 + x = -13.937359865 Solving 1.5 + x = -13.937359865 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 = -13.937359865 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -13.937359865 + -1.5 x = -13.937359865 + -1.5 Combine like terms: -13.937359865 + -1.5 = -15.437359865 x = -15.437359865 Simplifying x = -15.437359865

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.437359865, -15.437359865}

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