0=2x^2+x-12

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


Simplifying
0 = 2x2 + x + -12

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

Solving
0 = -12 + x + 2x2

Solving for variable 'x'.

Combine like terms: 0 + 12 = 12
12 + -1x + -2x2 = -12 + x + 2x2 + 12 + -1x + -2x2

Reorder the terms:
12 + -1x + -2x2 = -12 + 12 + x + -1x + 2x2 + -2x2

Combine like terms: -12 + 12 = 0
12 + -1x + -2x2 = 0 + x + -1x + 2x2 + -2x2
12 + -1x + -2x2 = x + -1x + 2x2 + -2x2

Combine like terms: x + -1x = 0
12 + -1x + -2x2 = 0 + 2x2 + -2x2
12 + -1x + -2x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
12 + -1x + -2x2 = 0

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

Divide each side by '-2'.
-6 + 0.5x + x2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 0.5x + 6 + x2 = 0 + 6

Reorder the terms:
-6 + 6 + 0.5x + x2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 0.5x + x2 = 0 + 6
0.5x + x2 = 0 + 6

Combine like terms: 0 + 6 = 6
0.5x + x2 = 6

The x term is 0.5x.  Take half its coefficient (0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
0.5x + 0.0625 + x2 = 6 + 0.0625

Reorder the terms:
0.0625 + 0.5x + x2 = 6 + 0.0625

Combine like terms: 6 + 0.0625 = 6.0625
0.0625 + 0.5x + x2 = 6.0625

Factor a perfect square on the left side:
(x + 0.25)(x + 0.25) = 6.0625

Calculate the square root of the right side: 2.46221445

Break this problem into two subproblems by setting 
(x + 0.25) equal to 2.46221445 and -2.46221445.

Subproblem 1

x + 0.25 = 2.46221445 Simplifying x + 0.25 = 2.46221445 Reorder the terms: 0.25 + x = 2.46221445 Solving 0.25 + x = 2.46221445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = 2.46221445 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = 2.46221445 + -0.25 x = 2.46221445 + -0.25 Combine like terms: 2.46221445 + -0.25 = 2.21221445 x = 2.21221445 Simplifying x = 2.21221445

Subproblem 2

x + 0.25 = -2.46221445 Simplifying x + 0.25 = -2.46221445 Reorder the terms: 0.25 + x = -2.46221445 Solving 0.25 + x = -2.46221445 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.25' to each side of the equation. 0.25 + -0.25 + x = -2.46221445 + -0.25 Combine like terms: 0.25 + -0.25 = 0.00 0.00 + x = -2.46221445 + -0.25 x = -2.46221445 + -0.25 Combine like terms: -2.46221445 + -0.25 = -2.71221445 x = -2.71221445 Simplifying x = -2.71221445

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.21221445, -2.71221445}

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