-x^2+22x+13=0

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Solution for -x^2+22x+13=0 equation:


Simplifying
-1x2 + 22x + 13 = 0

Reorder the terms:
13 + 22x + -1x2 = 0

Solving
13 + 22x + -1x2 = 0

Solving for variable 'x'.

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

Divide each side by '-1'.
-13 + -22x + x2 = 0

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + -22x + 13 + x2 = 0 + 13

Reorder the terms:
-13 + 13 + -22x + x2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + -22x + x2 = 0 + 13
-22x + x2 = 0 + 13

Combine like terms: 0 + 13 = 13
-22x + x2 = 13

The x term is -22x.  Take half its coefficient (-11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
-22x + 121 + x2 = 13 + 121

Reorder the terms:
121 + -22x + x2 = 13 + 121

Combine like terms: 13 + 121 = 134
121 + -22x + x2 = 134

Factor a perfect square on the left side:
(x + -11)(x + -11) = 134

Calculate the square root of the right side: 11.575836903

Break this problem into two subproblems by setting 
(x + -11) equal to 11.575836903 and -11.575836903.

Subproblem 1

x + -11 = 11.575836903 Simplifying x + -11 = 11.575836903 Reorder the terms: -11 + x = 11.575836903 Solving -11 + x = 11.575836903 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + x = 11.575836903 + 11 Combine like terms: -11 + 11 = 0 0 + x = 11.575836903 + 11 x = 11.575836903 + 11 Combine like terms: 11.575836903 + 11 = 22.575836903 x = 22.575836903 Simplifying x = 22.575836903

Subproblem 2

x + -11 = -11.575836903 Simplifying x + -11 = -11.575836903 Reorder the terms: -11 + x = -11.575836903 Solving -11 + x = -11.575836903 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + x = -11.575836903 + 11 Combine like terms: -11 + 11 = 0 0 + x = -11.575836903 + 11 x = -11.575836903 + 11 Combine like terms: -11.575836903 + 11 = -0.575836903 x = -0.575836903 Simplifying x = -0.575836903

Solution

The solution to the problem is based on the solutions from the subproblems. x = {22.575836903, -0.575836903}

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