12x^2+x+5=8

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Solution for 12x^2+x+5=8 equation:


Simplifying
12x2 + x + 5 = 8

Reorder the terms:
5 + x + 12x2 = 8

Solving
5 + x + 12x2 = 8

Solving for variable 'x'.

Reorder the terms:
5 + -8 + x + 12x2 = 8 + -8

Combine like terms: 5 + -8 = -3
-3 + x + 12x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-3 + x + 12x2 = 0

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

Divide each side by '12'.
-0.25 + 0.08333333333x + x2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + 0.08333333333x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + 0.08333333333x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + 0.08333333333x + x2 = 0 + 0.25
0.08333333333x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
0.08333333333x + x2 = 0.25

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

Add '0.25' to each side of the equation.
0.08333333333x + 0.25 + x2 = 0.25 + 0.25

Reorder the terms:
0.25 + 0.08333333333x + x2 = 0.25 + 0.25

Combine like terms: 0.25 + 0.25 = 0.5
0.25 + 0.08333333333x + x2 = 0.5

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 0.5

Calculate the square root of the right side: 0.707106781

Break this problem into two subproblems by setting 
(x + 0.5) equal to 0.707106781 and -0.707106781.

Subproblem 1

x + 0.5 = 0.707106781 Simplifying x + 0.5 = 0.707106781 Reorder the terms: 0.5 + x = 0.707106781 Solving 0.5 + x = 0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 0.707106781 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 0.707106781 + -0.5 x = 0.707106781 + -0.5 Combine like terms: 0.707106781 + -0.5 = 0.207106781 x = 0.207106781 Simplifying x = 0.207106781

Subproblem 2

x + 0.5 = -0.707106781 Simplifying x + 0.5 = -0.707106781 Reorder the terms: 0.5 + x = -0.707106781 Solving 0.5 + x = -0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -0.707106781 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -0.707106781 + -0.5 x = -0.707106781 + -0.5 Combine like terms: -0.707106781 + -0.5 = -1.207106781 x = -1.207106781 Simplifying x = -1.207106781

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.207106781, -1.207106781}

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