28x^2-210x+210=0

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Solution for 28x^2-210x+210=0 equation: 


Simplifying
28x2 + -210x + 210 = 0

Reorder the terms:
210 + -210x + 28x2 = 0

Solving
210 + -210x + 28x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '14'.
14(15 + -15x + 2x2) = 0

Ignore the factor 14.

Subproblem 1
Set the factor '(15 + -15x + 2x2)' equal to zero and attempt to solve:

Simplifying
15 + -15x + 2x2 = 0

Solving
15 + -15x + 2x2 = 0

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

Divide each side by '2'.
7.5 + -7.5x + x2 = 0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + -7.5x + -7.5 + x2 = 0 + -7.5

Reorder the terms:
7.5 + -7.5 + -7.5x + x2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -7.5x + x2 = 0 + -7.5
-7.5x + x2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
-7.5x + x2 = -7.5

The x term is -7.5x.  Take half its coefficient (-3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
-7.5x + 14.0625 + x2 = -7.5 + 14.0625

Reorder the terms:
14.0625 + -7.5x + x2 = -7.5 + 14.0625

Combine like terms: -7.5 + 14.0625 = 6.5625
14.0625 + -7.5x + x2 = 6.5625

Factor a perfect square on the left side:
(x + -3.75)(x + -3.75) = 6.5625

Calculate the square root of the right side: 2.561737691

Break this problem into two subproblems by setting 
(x + -3.75) equal to 2.561737691 and -2.561737691.


Subproblem 1
x + -3.75 = 2.561737691

Simplifying
x + -3.75 = 2.561737691

Reorder the terms:
-3.75 + x = 2.561737691

Solving
-3.75 + x = 2.561737691

Solving for variable 'x'.

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

Add '3.75' to each side of the equation.
-3.75 + 3.75 + x = 2.561737691 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + x = 2.561737691 + 3.75
x = 2.561737691 + 3.75

Combine like terms: 2.561737691 + 3.75 = 6.311737691
x = 6.311737691

Simplifying
x = 6.311737691


Subproblem 2
x + -3.75 = -2.561737691

Simplifying
x + -3.75 = -2.561737691

Reorder the terms:
-3.75 + x = -2.561737691

Solving
-3.75 + x = -2.561737691

Solving for variable 'x'.

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

Add '3.75' to each side of the equation.
-3.75 + 3.75 + x = -2.561737691 + 3.75

Combine like terms: -3.75 + 3.75 = 0.00
0.00 + x = -2.561737691 + 3.75
x = -2.561737691 + 3.75

Combine like terms: -2.561737691 + 3.75 = 1.188262309
x = 1.188262309

Simplifying
x = 1.188262309


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {6.311737691, 1.188262309}
Solution
x = {6.311737691, 1.188262309}

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