3x^2+12x-54=2

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Solution for 3x^2+12x-54=2 equation:


Simplifying
3x2 + 12x + -54 = 2

Reorder the terms:
-54 + 12x + 3x2 = 2

Solving
-54 + 12x + 3x2 = 2

Solving for variable 'x'.

Reorder the terms:
-54 + -2 + 12x + 3x2 = 2 + -2

Combine like terms: -54 + -2 = -56
-56 + 12x + 3x2 = 2 + -2

Combine like terms: 2 + -2 = 0
-56 + 12x + 3x2 = 0

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
-18.66666667 + 4x + x2 = 0

Move the constant term to the right:

Add '18.66666667' to each side of the equation.
-18.66666667 + 4x + 18.66666667 + x2 = 0 + 18.66666667

Reorder the terms:
-18.66666667 + 18.66666667 + 4x + x2 = 0 + 18.66666667

Combine like terms: -18.66666667 + 18.66666667 = 0.00000000
0.00000000 + 4x + x2 = 0 + 18.66666667
4x + x2 = 0 + 18.66666667

Combine like terms: 0 + 18.66666667 = 18.66666667
4x + x2 = 18.66666667

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4x + 4 + x2 = 18.66666667 + 4

Reorder the terms:
4 + 4x + x2 = 18.66666667 + 4

Combine like terms: 18.66666667 + 4 = 22.66666667
4 + 4x + x2 = 22.66666667

Factor a perfect square on the left side:
(x + 2)(x + 2) = 22.66666667

Calculate the square root of the right side: 4.760952286

Break this problem into two subproblems by setting 
(x + 2) equal to 4.760952286 and -4.760952286.

Subproblem 1

x + 2 = 4.760952286 Simplifying x + 2 = 4.760952286 Reorder the terms: 2 + x = 4.760952286 Solving 2 + x = 4.760952286 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 4.760952286 + -2 Combine like terms: 2 + -2 = 0 0 + x = 4.760952286 + -2 x = 4.760952286 + -2 Combine like terms: 4.760952286 + -2 = 2.760952286 x = 2.760952286 Simplifying x = 2.760952286

Subproblem 2

x + 2 = -4.760952286 Simplifying x + 2 = -4.760952286 Reorder the terms: 2 + x = -4.760952286 Solving 2 + x = -4.760952286 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -4.760952286 + -2 Combine like terms: 2 + -2 = 0 0 + x = -4.760952286 + -2 x = -4.760952286 + -2 Combine like terms: -4.760952286 + -2 = -6.760952286 x = -6.760952286 Simplifying x = -6.760952286

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.760952286, -6.760952286}

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