11x^2-28x+1=0

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Solution for 11x^2-28x+1=0 equation:


Simplifying
11x2 + -28x + 1 = 0

Reorder the terms:
1 + -28x + 11x2 = 0

Solving
1 + -28x + 11x2 = 0

Solving for variable 'x'.

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

Divide each side by '11'.
0.09090909091 + -2.545454545x + x2 = 0

Move the constant term to the right:

Add '-0.09090909091' to each side of the equation.
0.09090909091 + -2.545454545x + -0.09090909091 + x2 = 0 + -0.09090909091

Reorder the terms:
0.09090909091 + -0.09090909091 + -2.545454545x + x2 = 0 + -0.09090909091

Combine like terms: 0.09090909091 + -0.09090909091 = 0.00000000000
0.00000000000 + -2.545454545x + x2 = 0 + -0.09090909091
-2.545454545x + x2 = 0 + -0.09090909091

Combine like terms: 0 + -0.09090909091 = -0.09090909091
-2.545454545x + x2 = -0.09090909091

The x term is -2.545454545x.  Take half its coefficient (-1.272727273).
Square it (1.619834711) and add it to both sides.

Add '1.619834711' to each side of the equation.
-2.545454545x + 1.619834711 + x2 = -0.09090909091 + 1.619834711

Reorder the terms:
1.619834711 + -2.545454545x + x2 = -0.09090909091 + 1.619834711

Combine like terms: -0.09090909091 + 1.619834711 = 1.52892562009
1.619834711 + -2.545454545x + x2 = 1.52892562009

Factor a perfect square on the left side:
(x + -1.272727273)(x + -1.272727273) = 1.52892562009

Calculate the square root of the right side: 1.236497319

Break this problem into two subproblems by setting 
(x + -1.272727273) equal to 1.236497319 and -1.236497319.

Subproblem 1

x + -1.272727273 = 1.236497319 Simplifying x + -1.272727273 = 1.236497319 Reorder the terms: -1.272727273 + x = 1.236497319 Solving -1.272727273 + x = 1.236497319 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.272727273' to each side of the equation. -1.272727273 + 1.272727273 + x = 1.236497319 + 1.272727273 Combine like terms: -1.272727273 + 1.272727273 = 0.000000000 0.000000000 + x = 1.236497319 + 1.272727273 x = 1.236497319 + 1.272727273 Combine like terms: 1.236497319 + 1.272727273 = 2.509224592 x = 2.509224592 Simplifying x = 2.509224592

Subproblem 2

x + -1.272727273 = -1.236497319 Simplifying x + -1.272727273 = -1.236497319 Reorder the terms: -1.272727273 + x = -1.236497319 Solving -1.272727273 + x = -1.236497319 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.272727273' to each side of the equation. -1.272727273 + 1.272727273 + x = -1.236497319 + 1.272727273 Combine like terms: -1.272727273 + 1.272727273 = 0.000000000 0.000000000 + x = -1.236497319 + 1.272727273 x = -1.236497319 + 1.272727273 Combine like terms: -1.236497319 + 1.272727273 = 0.036229954 x = 0.036229954 Simplifying x = 0.036229954

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.509224592, 0.036229954}

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