2x^2+12x=3

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


Simplifying
2x2 + 12x = 3

Reorder the terms:
12x + 2x2 = 3

Solving
12x + 2x2 = 3

Solving for variable 'x'.

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

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

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

Divide each side by '2'.
-1.5 + 6x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + 6x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + 6x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + 6x + x2 = 0 + 1.5
6x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
6x + x2 = 1.5

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 1.5 + 9

Reorder the terms:
9 + 6x + x2 = 1.5 + 9

Combine like terms: 1.5 + 9 = 10.5
9 + 6x + x2 = 10.5

Factor a perfect square on the left side:
(x + 3)(x + 3) = 10.5

Calculate the square root of the right side: 3.240370349

Break this problem into two subproblems by setting 
(x + 3) equal to 3.240370349 and -3.240370349.

Subproblem 1

x + 3 = 3.240370349 Simplifying x + 3 = 3.240370349 Reorder the terms: 3 + x = 3.240370349 Solving 3 + x = 3.240370349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 3.240370349 + -3 Combine like terms: 3 + -3 = 0 0 + x = 3.240370349 + -3 x = 3.240370349 + -3 Combine like terms: 3.240370349 + -3 = 0.240370349 x = 0.240370349 Simplifying x = 0.240370349

Subproblem 2

x + 3 = -3.240370349 Simplifying x + 3 = -3.240370349 Reorder the terms: 3 + x = -3.240370349 Solving 3 + x = -3.240370349 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -3.240370349 + -3 Combine like terms: 3 + -3 = 0 0 + x = -3.240370349 + -3 x = -3.240370349 + -3 Combine like terms: -3.240370349 + -3 = -6.240370349 x = -6.240370349 Simplifying x = -6.240370349

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.240370349, -6.240370349}

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