(x)=x^2-20x+41

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Solution for (x)=x^2-20x+41 equation:


Simplifying
(x) = x2 + -20x + 41
x = x2 + -20x + 41

Reorder the terms:
x = 41 + -20x + x2

Solving
x = 41 + -20x + x2

Solving for variable 'x'.

Reorder the terms:
-41 + x + 20x + -1x2 = 41 + -20x + x2 + -41 + 20x + -1x2

Combine like terms: x + 20x = 21x
-41 + 21x + -1x2 = 41 + -20x + x2 + -41 + 20x + -1x2

Reorder the terms:
-41 + 21x + -1x2 = 41 + -41 + -20x + 20x + x2 + -1x2

Combine like terms: 41 + -41 = 0
-41 + 21x + -1x2 = 0 + -20x + 20x + x2 + -1x2
-41 + 21x + -1x2 = -20x + 20x + x2 + -1x2

Combine like terms: -20x + 20x = 0
-41 + 21x + -1x2 = 0 + x2 + -1x2
-41 + 21x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-41 + 21x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
41 + -21x + x2 = 0

Move the constant term to the right:

Add '-41' to each side of the equation.
41 + -21x + -41 + x2 = 0 + -41

Reorder the terms:
41 + -41 + -21x + x2 = 0 + -41

Combine like terms: 41 + -41 = 0
0 + -21x + x2 = 0 + -41
-21x + x2 = 0 + -41

Combine like terms: 0 + -41 = -41
-21x + x2 = -41

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 = -41 + 110.25

Reorder the terms:
110.25 + -21x + x2 = -41 + 110.25

Combine like terms: -41 + 110.25 = 69.25
110.25 + -21x + x2 = 69.25

Factor a perfect square on the left side:
(x + -10.5)(x + -10.5) = 69.25

Calculate the square root of the right side: 8.321658489

Break this problem into two subproblems by setting 
(x + -10.5) equal to 8.321658489 and -8.321658489.

Subproblem 1

x + -10.5 = 8.321658489 Simplifying x + -10.5 = 8.321658489 Reorder the terms: -10.5 + x = 8.321658489 Solving -10.5 + x = 8.321658489 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 = 8.321658489 + 10.5 Combine like terms: -10.5 + 10.5 = 0.0 0.0 + x = 8.321658489 + 10.5 x = 8.321658489 + 10.5 Combine like terms: 8.321658489 + 10.5 = 18.821658489 x = 18.821658489 Simplifying x = 18.821658489

Subproblem 2

x + -10.5 = -8.321658489 Simplifying x + -10.5 = -8.321658489 Reorder the terms: -10.5 + x = -8.321658489 Solving -10.5 + x = -8.321658489 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 = -8.321658489 + 10.5 Combine like terms: -10.5 + 10.5 = 0.0 0.0 + x = -8.321658489 + 10.5 x = -8.321658489 + 10.5 Combine like terms: -8.321658489 + 10.5 = 2.178341511 x = 2.178341511 Simplifying x = 2.178341511

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.821658489, 2.178341511}

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