18x^2-x-2=0

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Solution for 18x^2-x-2=0 equation:


Simplifying
18x2 + -1x + -2 = 0

Reorder the terms:
-2 + -1x + 18x2 = 0

Solving
-2 + -1x + 18x2 = 0

Solving for variable 'x'.

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

Divide each side by '18'.
-0.1111111111 + -0.05555555556x + x2 = 0

Move the constant term to the right:

Add '0.1111111111' to each side of the equation.
-0.1111111111 + -0.05555555556x + 0.1111111111 + x2 = 0 + 0.1111111111

Reorder the terms:
-0.1111111111 + 0.1111111111 + -0.05555555556x + x2 = 0 + 0.1111111111

Combine like terms: -0.1111111111 + 0.1111111111 = 0.0000000000
0.0000000000 + -0.05555555556x + x2 = 0 + 0.1111111111
-0.05555555556x + x2 = 0 + 0.1111111111

Combine like terms: 0 + 0.1111111111 = 0.1111111111
-0.05555555556x + x2 = 0.1111111111

The x term is -0.05555555556x.  Take half its coefficient (-0.02777777778).
Square it (0.0007716049384) and add it to both sides.

Add '0.0007716049384' to each side of the equation.
-0.05555555556x + 0.0007716049384 + x2 = 0.1111111111 + 0.0007716049384

Reorder the terms:
0.0007716049384 + -0.05555555556x + x2 = 0.1111111111 + 0.0007716049384

Combine like terms: 0.1111111111 + 0.0007716049384 = 0.1118827160384
0.0007716049384 + -0.05555555556x + x2 = 0.1118827160384

Factor a perfect square on the left side:
(x + -0.02777777778)(x + -0.02777777778) = 0.1118827160384

Calculate the square root of the right side: 0.334488738

Break this problem into two subproblems by setting 
(x + -0.02777777778) equal to 0.334488738 and -0.334488738.

Subproblem 1

x + -0.02777777778 = 0.334488738 Simplifying x + -0.02777777778 = 0.334488738 Reorder the terms: -0.02777777778 + x = 0.334488738 Solving -0.02777777778 + x = 0.334488738 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.02777777778' to each side of the equation. -0.02777777778 + 0.02777777778 + x = 0.334488738 + 0.02777777778 Combine like terms: -0.02777777778 + 0.02777777778 = 0.00000000000 0.00000000000 + x = 0.334488738 + 0.02777777778 x = 0.334488738 + 0.02777777778 Combine like terms: 0.334488738 + 0.02777777778 = 0.36226651578 x = 0.36226651578 Simplifying x = 0.36226651578

Subproblem 2

x + -0.02777777778 = -0.334488738 Simplifying x + -0.02777777778 = -0.334488738 Reorder the terms: -0.02777777778 + x = -0.334488738 Solving -0.02777777778 + x = -0.334488738 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.02777777778' to each side of the equation. -0.02777777778 + 0.02777777778 + x = -0.334488738 + 0.02777777778 Combine like terms: -0.02777777778 + 0.02777777778 = 0.00000000000 0.00000000000 + x = -0.334488738 + 0.02777777778 x = -0.334488738 + 0.02777777778 Combine like terms: -0.334488738 + 0.02777777778 = -0.30671096022 x = -0.30671096022 Simplifying x = -0.30671096022

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.36226651578, -0.30671096022}

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