(3+9)x^2+55x+6=0

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Solution for (3+9)x^2+55x+6=0 equation:


Simplifying
(3 + 9) * x2 + 55x + 6 = 0

Combine like terms: 3 + 9 = 12
(12) * x2 + 55x + 6 = 0

Reorder the terms:
6 + 55x + 12x2 = 0

Solving
6 + 55x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
0.5 + 4.583333333x + x2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 4.583333333x + -0.5 + x2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 4.583333333x + x2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 4.583333333x + x2 = 0 + -0.5
4.583333333x + x2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
4.583333333x + x2 = -0.5

The x term is 4.583333333x.  Take half its coefficient (2.291666667).
Square it (5.251736113) and add it to both sides.

Add '5.251736113' to each side of the equation.
4.583333333x + 5.251736113 + x2 = -0.5 + 5.251736113

Reorder the terms:
5.251736113 + 4.583333333x + x2 = -0.5 + 5.251736113

Combine like terms: -0.5 + 5.251736113 = 4.751736113
5.251736113 + 4.583333333x + x2 = 4.751736113

Factor a perfect square on the left side:
(x + 2.291666667)(x + 2.291666667) = 4.751736113

Calculate the square root of the right side: 2.179847727

Break this problem into two subproblems by setting 
(x + 2.291666667) equal to 2.179847727 and -2.179847727.

Subproblem 1

x + 2.291666667 = 2.179847727 Simplifying x + 2.291666667 = 2.179847727 Reorder the terms: 2.291666667 + x = 2.179847727 Solving 2.291666667 + x = 2.179847727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.291666667' to each side of the equation. 2.291666667 + -2.291666667 + x = 2.179847727 + -2.291666667 Combine like terms: 2.291666667 + -2.291666667 = 0.000000000 0.000000000 + x = 2.179847727 + -2.291666667 x = 2.179847727 + -2.291666667 Combine like terms: 2.179847727 + -2.291666667 = -0.11181894 x = -0.11181894 Simplifying x = -0.11181894

Subproblem 2

x + 2.291666667 = -2.179847727 Simplifying x + 2.291666667 = -2.179847727 Reorder the terms: 2.291666667 + x = -2.179847727 Solving 2.291666667 + x = -2.179847727 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.291666667' to each side of the equation. 2.291666667 + -2.291666667 + x = -2.179847727 + -2.291666667 Combine like terms: 2.291666667 + -2.291666667 = 0.000000000 0.000000000 + x = -2.179847727 + -2.291666667 x = -2.179847727 + -2.291666667 Combine like terms: -2.179847727 + -2.291666667 = -4.471514394 x = -4.471514394 Simplifying x = -4.471514394

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.11181894, -4.471514394}

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