6x^2+x-400=0

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Solution for 6x^2+x-400=0 equation: 


Simplifying
6x2 + x + -400 = 0

Reorder the terms:
-400 + x + 6x2 = 0

Solving
-400 + x + 6x2 = 0

Solving for variable 'x'.

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

Divide each side by '6'.
-66.66666667 + 0.1666666667x + x2 = 0

Move the constant term to the right:

Add '66.66666667' to each side of the equation.
-66.66666667 + 0.1666666667x + 66.66666667 + x2 = 0 + 66.66666667

Reorder the terms:
-66.66666667 + 66.66666667 + 0.1666666667x + x2 = 0 + 66.66666667

Combine like terms: -66.66666667 + 66.66666667 = 0.00000000
0.00000000 + 0.1666666667x + x2 = 0 + 66.66666667
0.1666666667x + x2 = 0 + 66.66666667

Combine like terms: 0 + 66.66666667 = 66.66666667
0.1666666667x + x2 = 66.66666667

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.
0.1666666667x + 0.25 + x2 = 66.66666667 + 0.25

Reorder the terms:
0.25 + 0.1666666667x + x2 = 66.66666667 + 0.25

Combine like terms: 66.66666667 + 0.25 = 66.91666667
0.25 + 0.1666666667x + x2 = 66.91666667

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 66.91666667

Calculate the square root of the right side: 8.180260795

Break this problem into two subproblems by setting 
(x + 0.5) equal to 8.180260795 and -8.180260795.


Subproblem 1
x + 0.5 = 8.180260795

Simplifying
x + 0.5 = 8.180260795

Reorder the terms:
0.5 + x = 8.180260795

Solving
0.5 + x = 8.180260795

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 = 8.180260795 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = 8.180260795 + -0.5
x = 8.180260795 + -0.5

Combine like terms: 8.180260795 + -0.5 = 7.680260795
x = 7.680260795

Simplifying
x = 7.680260795


Subproblem 2
x + 0.5 = -8.180260795

Simplifying
x + 0.5 = -8.180260795

Reorder the terms:
0.5 + x = -8.180260795

Solving
0.5 + x = -8.180260795

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 = -8.180260795 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + x = -8.180260795 + -0.5
x = -8.180260795 + -0.5

Combine like terms: -8.180260795 + -0.5 = -8.680260795
x = -8.680260795

Simplifying
x = -8.680260795


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {7.680260795, -8.680260795}

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