x^2-11x-67=0

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Solution for x^2-11x-67=0 equation:


Simplifying
x2 + -11x + -67 = 0

Reorder the terms:
-67 + -11x + x2 = 0

Solving
-67 + -11x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '67' to each side of the equation.
-67 + -11x + 67 + x2 = 0 + 67

Reorder the terms:
-67 + 67 + -11x + x2 = 0 + 67

Combine like terms: -67 + 67 = 0
0 + -11x + x2 = 0 + 67
-11x + x2 = 0 + 67

Combine like terms: 0 + 67 = 67
-11x + x2 = 67

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 = 67 + 30.25

Reorder the terms:
30.25 + -11x + x2 = 67 + 30.25

Combine like terms: 67 + 30.25 = 97.25
30.25 + -11x + x2 = 97.25

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 97.25

Calculate the square root of the right side: 9.861541462

Break this problem into two subproblems by setting 
(x + -5.5) equal to 9.861541462 and -9.861541462.

Subproblem 1

x + -5.5 = 9.861541462 Simplifying x + -5.5 = 9.861541462 Reorder the terms: -5.5 + x = 9.861541462 Solving -5.5 + x = 9.861541462 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 = 9.861541462 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 9.861541462 + 5.5 x = 9.861541462 + 5.5 Combine like terms: 9.861541462 + 5.5 = 15.361541462 x = 15.361541462 Simplifying x = 15.361541462

Subproblem 2

x + -5.5 = -9.861541462 Simplifying x + -5.5 = -9.861541462 Reorder the terms: -5.5 + x = -9.861541462 Solving -5.5 + x = -9.861541462 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 = -9.861541462 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -9.861541462 + 5.5 x = -9.861541462 + 5.5 Combine like terms: -9.861541462 + 5.5 = -4.361541462 x = -4.361541462 Simplifying x = -4.361541462

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.361541462, -4.361541462}

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