x^2-11x-26=09

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Solution for x^2-11x-26=09 equation:


Simplifying
x2 + -11x + -26 = 9

Reorder the terms:
-26 + -11x + x2 = 9

Solving
-26 + -11x + x2 = 9

Solving for variable 'x'.

Reorder the terms:
-26 + -9 + -11x + x2 = 9 + -9

Combine like terms: -26 + -9 = -35
-35 + -11x + x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-35 + -11x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '35' to each side of the equation.
-35 + -11x + 35 + x2 = 0 + 35

Reorder the terms:
-35 + 35 + -11x + x2 = 0 + 35

Combine like terms: -35 + 35 = 0
0 + -11x + x2 = 0 + 35
-11x + x2 = 0 + 35

Combine like terms: 0 + 35 = 35
-11x + x2 = 35

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 = 35 + 30.25

Reorder the terms:
30.25 + -11x + x2 = 35 + 30.25

Combine like terms: 35 + 30.25 = 65.25
30.25 + -11x + x2 = 65.25

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 65.25

Calculate the square root of the right side: 8.077747211

Break this problem into two subproblems by setting 
(x + -5.5) equal to 8.077747211 and -8.077747211.

Subproblem 1

x + -5.5 = 8.077747211 Simplifying x + -5.5 = 8.077747211 Reorder the terms: -5.5 + x = 8.077747211 Solving -5.5 + x = 8.077747211 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 = 8.077747211 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 8.077747211 + 5.5 x = 8.077747211 + 5.5 Combine like terms: 8.077747211 + 5.5 = 13.577747211 x = 13.577747211 Simplifying x = 13.577747211

Subproblem 2

x + -5.5 = -8.077747211 Simplifying x + -5.5 = -8.077747211 Reorder the terms: -5.5 + x = -8.077747211 Solving -5.5 + x = -8.077747211 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 = -8.077747211 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -8.077747211 + 5.5 x = -8.077747211 + 5.5 Combine like terms: -8.077747211 + 5.5 = -2.577747211 x = -2.577747211 Simplifying x = -2.577747211

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.577747211, -2.577747211}

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