X^2-11X-18=

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Solution for X^2-11X-18= equation:


Simplifying
X2 + -11X + -18 = 0

Reorder the terms:
-18 + -11X + X2 = 0

Solving
-18 + -11X + X2 = 0

Solving for variable 'X'.

Begin completing the square.

Move the constant term to the right:

Add '18' to each side of the equation.
-18 + -11X + 18 + X2 = 0 + 18

Reorder the terms:
-18 + 18 + -11X + X2 = 0 + 18

Combine like terms: -18 + 18 = 0
0 + -11X + X2 = 0 + 18
-11X + X2 = 0 + 18

Combine like terms: 0 + 18 = 18
-11X + X2 = 18

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 = 18 + 30.25

Reorder the terms:
30.25 + -11X + X2 = 18 + 30.25

Combine like terms: 18 + 30.25 = 48.25
30.25 + -11X + X2 = 48.25

Factor a perfect square on the left side:
(X + -5.5)(X + -5.5) = 48.25

Calculate the square root of the right side: 6.946221995

Break this problem into two subproblems by setting 
(X + -5.5) equal to 6.946221995 and -6.946221995.

Subproblem 1

X + -5.5 = 6.946221995 Simplifying X + -5.5 = 6.946221995 Reorder the terms: -5.5 + X = 6.946221995 Solving -5.5 + X = 6.946221995 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 = 6.946221995 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + X = 6.946221995 + 5.5 X = 6.946221995 + 5.5 Combine like terms: 6.946221995 + 5.5 = 12.446221995 X = 12.446221995 Simplifying X = 12.446221995

Subproblem 2

X + -5.5 = -6.946221995 Simplifying X + -5.5 = -6.946221995 Reorder the terms: -5.5 + X = -6.946221995 Solving -5.5 + X = -6.946221995 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 = -6.946221995 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + X = -6.946221995 + 5.5 X = -6.946221995 + 5.5 Combine like terms: -6.946221995 + 5.5 = -1.446221995 X = -1.446221995 Simplifying X = -1.446221995

Solution

The solution to the problem is based on the solutions from the subproblems. X = {12.446221995, -1.446221995}

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