0=2x^2+12x-5

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Solution for 0=2x^2+12x-5 equation:


Simplifying
0 = 2x2 + 12x + -5

Reorder the terms:
0 = -5 + 12x + 2x2

Solving
0 = -5 + 12x + 2x2

Solving for variable 'x'.

Combine like terms: 0 + 5 = 5
5 + -12x + -2x2 = -5 + 12x + 2x2 + 5 + -12x + -2x2

Reorder the terms:
5 + -12x + -2x2 = -5 + 5 + 12x + -12x + 2x2 + -2x2

Combine like terms: -5 + 5 = 0
5 + -12x + -2x2 = 0 + 12x + -12x + 2x2 + -2x2
5 + -12x + -2x2 = 12x + -12x + 2x2 + -2x2

Combine like terms: 12x + -12x = 0
5 + -12x + -2x2 = 0 + 2x2 + -2x2
5 + -12x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
5 + -12x + -2x2 = 0

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

Divide each side by '-2'.
-2.5 + 6x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + 6x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + 6x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + 6x + x2 = 0 + 2.5
6x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
6x + x2 = 2.5

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 = 2.5 + 9

Reorder the terms:
9 + 6x + x2 = 2.5 + 9

Combine like terms: 2.5 + 9 = 11.5
9 + 6x + x2 = 11.5

Factor a perfect square on the left side:
(x + 3)(x + 3) = 11.5

Calculate the square root of the right side: 3.391164992

Break this problem into two subproblems by setting 
(x + 3) equal to 3.391164992 and -3.391164992.

Subproblem 1

x + 3 = 3.391164992 Simplifying x + 3 = 3.391164992 Reorder the terms: 3 + x = 3.391164992 Solving 3 + x = 3.391164992 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 = 3.391164992 + -3 Combine like terms: 3 + -3 = 0 0 + x = 3.391164992 + -3 x = 3.391164992 + -3 Combine like terms: 3.391164992 + -3 = 0.391164992 x = 0.391164992 Simplifying x = 0.391164992

Subproblem 2

x + 3 = -3.391164992 Simplifying x + 3 = -3.391164992 Reorder the terms: 3 + x = -3.391164992 Solving 3 + x = -3.391164992 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 = -3.391164992 + -3 Combine like terms: 3 + -3 = 0 0 + x = -3.391164992 + -3 x = -3.391164992 + -3 Combine like terms: -3.391164992 + -3 = -6.391164992 x = -6.391164992 Simplifying x = -6.391164992

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.391164992, -6.391164992}

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