11x^2-18=-2x

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


Simplifying
11x2 + -18 = -2x

Reorder the terms:
-18 + 11x2 = -2x

Solving
-18 + 11x2 = -2x

Solving for variable 'x'.

Reorder the terms:
-18 + 2x + 11x2 = -2x + 2x

Combine like terms: -2x + 2x = 0
-18 + 2x + 11x2 = 0

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

Divide each side by '11'.
-1.636363636 + 0.1818181818x + x2 = 0

Move the constant term to the right:

Add '1.636363636' to each side of the equation.
-1.636363636 + 0.1818181818x + 1.636363636 + x2 = 0 + 1.636363636

Reorder the terms:
-1.636363636 + 1.636363636 + 0.1818181818x + x2 = 0 + 1.636363636

Combine like terms: -1.636363636 + 1.636363636 = 0.000000000
0.000000000 + 0.1818181818x + x2 = 0 + 1.636363636
0.1818181818x + x2 = 0 + 1.636363636

Combine like terms: 0 + 1.636363636 = 1.636363636
0.1818181818x + x2 = 1.636363636

The x term is 0.1818181818x.  Take half its coefficient (0.0909090909).
Square it (0.008264462808) and add it to both sides.

Add '0.008264462808' to each side of the equation.
0.1818181818x + 0.008264462808 + x2 = 1.636363636 + 0.008264462808

Reorder the terms:
0.008264462808 + 0.1818181818x + x2 = 1.636363636 + 0.008264462808

Combine like terms: 1.636363636 + 0.008264462808 = 1.644628098808
0.008264462808 + 0.1818181818x + x2 = 1.644628098808

Factor a perfect square on the left side:
(x + 0.0909090909)(x + 0.0909090909) = 1.644628098808

Calculate the square root of the right side: 1.282430543

Break this problem into two subproblems by setting 
(x + 0.0909090909) equal to 1.282430543 and -1.282430543.

Subproblem 1

x + 0.0909090909 = 1.282430543 Simplifying x + 0.0909090909 = 1.282430543 Reorder the terms: 0.0909090909 + x = 1.282430543 Solving 0.0909090909 + x = 1.282430543 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0909090909' to each side of the equation. 0.0909090909 + -0.0909090909 + x = 1.282430543 + -0.0909090909 Combine like terms: 0.0909090909 + -0.0909090909 = 0.0000000000 0.0000000000 + x = 1.282430543 + -0.0909090909 x = 1.282430543 + -0.0909090909 Combine like terms: 1.282430543 + -0.0909090909 = 1.1915214521 x = 1.1915214521 Simplifying x = 1.1915214521

Subproblem 2

x + 0.0909090909 = -1.282430543 Simplifying x + 0.0909090909 = -1.282430543 Reorder the terms: 0.0909090909 + x = -1.282430543 Solving 0.0909090909 + x = -1.282430543 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0909090909' to each side of the equation. 0.0909090909 + -0.0909090909 + x = -1.282430543 + -0.0909090909 Combine like terms: 0.0909090909 + -0.0909090909 = 0.0000000000 0.0000000000 + x = -1.282430543 + -0.0909090909 x = -1.282430543 + -0.0909090909 Combine like terms: -1.282430543 + -0.0909090909 = -1.3733396339 x = -1.3733396339 Simplifying x = -1.3733396339

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.1915214521, -1.3733396339}

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