12x+3x^2=16

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Solution for 12x+3x^2=16 equation:


Simplifying
12x + 3x2 = 16

Solving
12x + 3x2 = 16

Solving for variable 'x'.

Reorder the terms:
-16 + 12x + 3x2 = 16 + -16

Combine like terms: 16 + -16 = 0
-16 + 12x + 3x2 = 0

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

Divide each side by '3'.
-5.333333333 + 4x + x2 = 0

Move the constant term to the right:

Add '5.333333333' to each side of the equation.
-5.333333333 + 4x + 5.333333333 + x2 = 0 + 5.333333333

Reorder the terms:
-5.333333333 + 5.333333333 + 4x + x2 = 0 + 5.333333333

Combine like terms: -5.333333333 + 5.333333333 = 0.000000000
0.000000000 + 4x + x2 = 0 + 5.333333333
4x + x2 = 0 + 5.333333333

Combine like terms: 0 + 5.333333333 = 5.333333333
4x + x2 = 5.333333333

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 = 5.333333333 + 4

Reorder the terms:
4 + 4x + x2 = 5.333333333 + 4

Combine like terms: 5.333333333 + 4 = 9.333333333
4 + 4x + x2 = 9.333333333

Factor a perfect square on the left side:
(x + 2)(x + 2) = 9.333333333

Calculate the square root of the right side: 3.055050463

Break this problem into two subproblems by setting 
(x + 2) equal to 3.055050463 and -3.055050463.

Subproblem 1

x + 2 = 3.055050463 Simplifying x + 2 = 3.055050463 Reorder the terms: 2 + x = 3.055050463 Solving 2 + x = 3.055050463 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 = 3.055050463 + -2 Combine like terms: 2 + -2 = 0 0 + x = 3.055050463 + -2 x = 3.055050463 + -2 Combine like terms: 3.055050463 + -2 = 1.055050463 x = 1.055050463 Simplifying x = 1.055050463

Subproblem 2

x + 2 = -3.055050463 Simplifying x + 2 = -3.055050463 Reorder the terms: 2 + x = -3.055050463 Solving 2 + x = -3.055050463 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 = -3.055050463 + -2 Combine like terms: 2 + -2 = 0 0 + x = -3.055050463 + -2 x = -3.055050463 + -2 Combine like terms: -3.055050463 + -2 = -5.055050463 x = -5.055050463 Simplifying x = -5.055050463

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.055050463, -5.055050463}

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