6+8x^2-x=18x^2

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Solution for 6+8x^2-x=18x^2 equation:


Simplifying
6 + 8x2 + -1x = 18x2

Reorder the terms:
6 + -1x + 8x2 = 18x2

Solving
6 + -1x + 8x2 = 18x2

Solving for variable 'x'.

Combine like terms: 8x2 + -18x2 = -10x2
6 + -1x + -10x2 = 18x2 + -18x2

Combine like terms: 18x2 + -18x2 = 0
6 + -1x + -10x2 = 0

Begin completing the square.  Divide all terms by
-10 the coefficient of the squared term: 

Divide each side by '-10'.
-0.6 + 0.1x + x2 = 0.0

Move the constant term to the right:

Add '0.6' to each side of the equation.
-0.6 + 0.1x + 0.6 + x2 = 0.0 + 0.6

Reorder the terms:
-0.6 + 0.6 + 0.1x + x2 = 0.0 + 0.6

Combine like terms: -0.6 + 0.6 = 0.0
0.0 + 0.1x + x2 = 0.0 + 0.6
0.1x + x2 = 0.0 + 0.6

Combine like terms: 0.0 + 0.6 = 0.6
0.1x + x2 = 0.6

The x term is 0.1x.  Take half its coefficient (0.05).
Square it (0.0025) and add it to both sides.

Add '0.0025' to each side of the equation.
0.1x + 0.0025 + x2 = 0.6 + 0.0025

Reorder the terms:
0.0025 + 0.1x + x2 = 0.6 + 0.0025

Combine like terms: 0.6 + 0.0025 = 0.6025
0.0025 + 0.1x + x2 = 0.6025

Factor a perfect square on the left side:
(x + 0.05)(x + 0.05) = 0.6025

Calculate the square root of the right side: 0.776208735

Break this problem into two subproblems by setting 
(x + 0.05) equal to 0.776208735 and -0.776208735.

Subproblem 1

x + 0.05 = 0.776208735 Simplifying x + 0.05 = 0.776208735 Reorder the terms: 0.05 + x = 0.776208735 Solving 0.05 + x = 0.776208735 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.05' to each side of the equation. 0.05 + -0.05 + x = 0.776208735 + -0.05 Combine like terms: 0.05 + -0.05 = 0.00 0.00 + x = 0.776208735 + -0.05 x = 0.776208735 + -0.05 Combine like terms: 0.776208735 + -0.05 = 0.726208735 x = 0.726208735 Simplifying x = 0.726208735

Subproblem 2

x + 0.05 = -0.776208735 Simplifying x + 0.05 = -0.776208735 Reorder the terms: 0.05 + x = -0.776208735 Solving 0.05 + x = -0.776208735 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.05' to each side of the equation. 0.05 + -0.05 + x = -0.776208735 + -0.05 Combine like terms: 0.05 + -0.05 = 0.00 0.00 + x = -0.776208735 + -0.05 x = -0.776208735 + -0.05 Combine like terms: -0.776208735 + -0.05 = -0.826208735 x = -0.826208735 Simplifying x = -0.826208735

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.726208735, -0.826208735}

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