x^2+3x-228=0

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Solution for x^2+3x-228=0 equation:


Simplifying
x2 + 3x + -228 = 0

Reorder the terms:
-228 + 3x + x2 = 0

Solving
-228 + 3x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '228' to each side of the equation.
-228 + 3x + 228 + x2 = 0 + 228

Reorder the terms:
-228 + 228 + 3x + x2 = 0 + 228

Combine like terms: -228 + 228 = 0
0 + 3x + x2 = 0 + 228
3x + x2 = 0 + 228

Combine like terms: 0 + 228 = 228
3x + x2 = 228

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 = 228 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 228 + 2.25

Combine like terms: 228 + 2.25 = 230.25
2.25 + 3x + x2 = 230.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 230.25

Calculate the square root of the right side: 15.173990905

Break this problem into two subproblems by setting 
(x + 1.5) equal to 15.173990905 and -15.173990905.

Subproblem 1

x + 1.5 = 15.173990905 Simplifying x + 1.5 = 15.173990905 Reorder the terms: 1.5 + x = 15.173990905 Solving 1.5 + x = 15.173990905 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 = 15.173990905 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 15.173990905 + -1.5 x = 15.173990905 + -1.5 Combine like terms: 15.173990905 + -1.5 = 13.673990905 x = 13.673990905 Simplifying x = 13.673990905

Subproblem 2

x + 1.5 = -15.173990905 Simplifying x + 1.5 = -15.173990905 Reorder the terms: 1.5 + x = -15.173990905 Solving 1.5 + x = -15.173990905 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 = -15.173990905 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -15.173990905 + -1.5 x = -15.173990905 + -1.5 Combine like terms: -15.173990905 + -1.5 = -16.673990905 x = -16.673990905 Simplifying x = -16.673990905

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.673990905, -16.673990905}

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