5x^2-20x+11=0

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Solution for 5x^2-20x+11=0 equation:


Simplifying
5x2 + -20x + 11 = 0

Reorder the terms:
11 + -20x + 5x2 = 0

Solving
11 + -20x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
2.2 + -4x + x2 = 0

Move the constant term to the right:

Add '-2.2' to each side of the equation.
2.2 + -4x + -2.2 + x2 = 0 + -2.2

Reorder the terms:
2.2 + -2.2 + -4x + x2 = 0 + -2.2

Combine like terms: 2.2 + -2.2 = 0.0
0.0 + -4x + x2 = 0 + -2.2
-4x + x2 = 0 + -2.2

Combine like terms: 0 + -2.2 = -2.2
-4x + x2 = -2.2

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = -2.2 + 4

Reorder the terms:
4 + -4x + x2 = -2.2 + 4

Combine like terms: -2.2 + 4 = 1.8
4 + -4x + x2 = 1.8

Factor a perfect square on the left side:
(x + -2)(x + -2) = 1.8

Calculate the square root of the right side: 1.341640787

Break this problem into two subproblems by setting 
(x + -2) equal to 1.341640787 and -1.341640787.

Subproblem 1

x + -2 = 1.341640787 Simplifying x + -2 = 1.341640787 Reorder the terms: -2 + x = 1.341640787 Solving -2 + x = 1.341640787 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 1.341640787 + 2 Combine like terms: -2 + 2 = 0 0 + x = 1.341640787 + 2 x = 1.341640787 + 2 Combine like terms: 1.341640787 + 2 = 3.341640787 x = 3.341640787 Simplifying x = 3.341640787

Subproblem 2

x + -2 = -1.341640787 Simplifying x + -2 = -1.341640787 Reorder the terms: -2 + x = -1.341640787 Solving -2 + x = -1.341640787 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -1.341640787 + 2 Combine like terms: -2 + 2 = 0 0 + x = -1.341640787 + 2 x = -1.341640787 + 2 Combine like terms: -1.341640787 + 2 = 0.658359213 x = 0.658359213 Simplifying x = 0.658359213

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.341640787, 0.658359213}

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