x^2-21x+92=0

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Solution for x^2-21x+92=0 equation:


Simplifying
x2 + -21x + 92 = 0

Reorder the terms:
92 + -21x + x2 = 0

Solving
92 + -21x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '-92' to each side of the equation.
92 + -21x + -92 + x2 = 0 + -92

Reorder the terms:
92 + -92 + -21x + x2 = 0 + -92

Combine like terms: 92 + -92 = 0
0 + -21x + x2 = 0 + -92
-21x + x2 = 0 + -92

Combine like terms: 0 + -92 = -92
-21x + x2 = -92

The x term is -21x.  Take half its coefficient (-10.5).
Square it (110.25) and add it to both sides.

Add '110.25' to each side of the equation.
-21x + 110.25 + x2 = -92 + 110.25

Reorder the terms:
110.25 + -21x + x2 = -92 + 110.25

Combine like terms: -92 + 110.25 = 18.25
110.25 + -21x + x2 = 18.25

Factor a perfect square on the left side:
(x + -10.5)(x + -10.5) = 18.25

Calculate the square root of the right side: 4.272001873

Break this problem into two subproblems by setting 
(x + -10.5) equal to 4.272001873 and -4.272001873.

Subproblem 1

x + -10.5 = 4.272001873 Simplifying x + -10.5 = 4.272001873 Reorder the terms: -10.5 + x = 4.272001873 Solving -10.5 + x = 4.272001873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10.5' to each side of the equation. -10.5 + 10.5 + x = 4.272001873 + 10.5 Combine like terms: -10.5 + 10.5 = 0.0 0.0 + x = 4.272001873 + 10.5 x = 4.272001873 + 10.5 Combine like terms: 4.272001873 + 10.5 = 14.772001873 x = 14.772001873 Simplifying x = 14.772001873

Subproblem 2

x + -10.5 = -4.272001873 Simplifying x + -10.5 = -4.272001873 Reorder the terms: -10.5 + x = -4.272001873 Solving -10.5 + x = -4.272001873 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10.5' to each side of the equation. -10.5 + 10.5 + x = -4.272001873 + 10.5 Combine like terms: -10.5 + 10.5 = 0.0 0.0 + x = -4.272001873 + 10.5 x = -4.272001873 + 10.5 Combine like terms: -4.272001873 + 10.5 = 6.227998127 x = 6.227998127 Simplifying x = 6.227998127

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.772001873, 6.227998127}

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