x^2-11x+20.25=0

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Solution for x^2-11x+20.25=0 equation:


Simplifying
x2 + -11x + 20.25 = 0

Reorder the terms:
20.25 + -11x + x2 = 0

Solving
20.25 + -11x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-20.25' to each side of the equation.
20.25 + -11x + -20.25 + x2 = 0 + -20.25

Reorder the terms:
20.25 + -20.25 + -11x + x2 = 0 + -20.25

Combine like terms: 20.25 + -20.25 = 0.00
0.00 + -11x + x2 = 0 + -20.25
-11x + x2 = 0 + -20.25

Combine like terms: 0 + -20.25 = -20.25
-11x + x2 = -20.25

The x term is -11x.  Take half its coefficient (-5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
-11x + 30.25 + x2 = -20.25 + 30.25

Reorder the terms:
30.25 + -11x + x2 = -20.25 + 30.25

Combine like terms: -20.25 + 30.25 = 10
30.25 + -11x + x2 = 10

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 10

Calculate the square root of the right side: 3.16227766

Break this problem into two subproblems by setting 
(x + -5.5) equal to 3.16227766 and -3.16227766.

Subproblem 1

x + -5.5 = 3.16227766 Simplifying x + -5.5 = 3.16227766 Reorder the terms: -5.5 + x = 3.16227766 Solving -5.5 + x = 3.16227766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x = 3.16227766 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 3.16227766 + 5.5 x = 3.16227766 + 5.5 Combine like terms: 3.16227766 + 5.5 = 8.66227766 x = 8.66227766 Simplifying x = 8.66227766

Subproblem 2

x + -5.5 = -3.16227766 Simplifying x + -5.5 = -3.16227766 Reorder the terms: -5.5 + x = -3.16227766 Solving -5.5 + x = -3.16227766 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x = -3.16227766 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -3.16227766 + 5.5 x = -3.16227766 + 5.5 Combine like terms: -3.16227766 + 5.5 = 2.33772234 x = 2.33772234 Simplifying x = 2.33772234

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.66227766, 2.33772234}

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