12x^2-42x+8=0

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Solution for 12x^2-42x+8=0 equation: 


Simplifying
12x2 + -42x + 8 = 0

Reorder the terms:
8 + -42x + 12x2 = 0

Solving
8 + -42x + 12x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '2'.
2(4 + -21x + 6x2) = 0

Ignore the factor 2.

Subproblem 1
Set the factor '(4 + -21x + 6x2)' equal to zero and attempt to solve:

Simplifying
4 + -21x + 6x2 = 0

Solving
4 + -21x + 6x2 = 0

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

Divide each side by '6'.
0.6666666667 + -3.5x + x2 = 0

Move the constant term to the right:

Add '-0.6666666667' to each side of the equation.
0.6666666667 + -3.5x + -0.6666666667 + x2 = 0 + -0.6666666667

Reorder the terms:
0.6666666667 + -0.6666666667 + -3.5x + x2 = 0 + -0.6666666667

Combine like terms: 0.6666666667 + -0.6666666667 = 0.0000000000
0.0000000000 + -3.5x + x2 = 0 + -0.6666666667
-3.5x + x2 = 0 + -0.6666666667

Combine like terms: 0 + -0.6666666667 = -0.6666666667
-3.5x + x2 = -0.6666666667

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = -0.6666666667 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = -0.6666666667 + 3.0625

Combine like terms: -0.6666666667 + 3.0625 = 2.3958333333
3.0625 + -3.5x + x2 = 2.3958333333

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 2.3958333333

Calculate the square root of the right side: 1.547847968

Break this problem into two subproblems by setting 
(x + -1.75) equal to 1.547847968 and -1.547847968.


Subproblem 1
x + -1.75 = 1.547847968

Simplifying
x + -1.75 = 1.547847968

Reorder the terms:
-1.75 + x = 1.547847968

Solving
-1.75 + x = 1.547847968

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '1.75' to each side of the equation.
-1.75 + 1.75 + x = 1.547847968 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + x = 1.547847968 + 1.75
x = 1.547847968 + 1.75

Combine like terms: 1.547847968 + 1.75 = 3.297847968
x = 3.297847968

Simplifying
x = 3.297847968


Subproblem 2
x + -1.75 = -1.547847968

Simplifying
x + -1.75 = -1.547847968

Reorder the terms:
-1.75 + x = -1.547847968

Solving
-1.75 + x = -1.547847968

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '1.75' to each side of the equation.
-1.75 + 1.75 + x = -1.547847968 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + x = -1.547847968 + 1.75
x = -1.547847968 + 1.75

Combine like terms: -1.547847968 + 1.75 = 0.202152032
x = 0.202152032

Simplifying
x = 0.202152032


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {3.297847968, 0.202152032}
Solution
x = {3.297847968, 0.202152032}

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