6x+18=4x^2+x^2

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Solution for 6x+18=4x^2+x^2 equation:


Simplifying
6x + 18 = 4x2 + x2

Reorder the terms:
18 + 6x = 4x2 + x2

Combine like terms: 4x2 + x2 = 5x2
18 + 6x = 5x2

Solving
18 + 6x = 5x2

Solving for variable 'x'.

Combine like terms: 5x2 + -5x2 = 0
18 + 6x + -5x2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-3.6 + -1.2x + x2 = 0

Move the constant term to the right:

Add '3.6' to each side of the equation.
-3.6 + -1.2x + 3.6 + x2 = 0 + 3.6

Reorder the terms:
-3.6 + 3.6 + -1.2x + x2 = 0 + 3.6

Combine like terms: -3.6 + 3.6 = 0.0
0.0 + -1.2x + x2 = 0 + 3.6
-1.2x + x2 = 0 + 3.6

Combine like terms: 0 + 3.6 = 3.6
-1.2x + x2 = 3.6

The x term is -1.2x.  Take half its coefficient (-0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
-1.2x + 0.36 + x2 = 3.6 + 0.36

Reorder the terms:
0.36 + -1.2x + x2 = 3.6 + 0.36

Combine like terms: 3.6 + 0.36 = 3.96
0.36 + -1.2x + x2 = 3.96

Factor a perfect square on the left side:
(x + -0.6)(x + -0.6) = 3.96

Calculate the square root of the right side: 1.989974874

Break this problem into two subproblems by setting 
(x + -0.6) equal to 1.989974874 and -1.989974874.

Subproblem 1

x + -0.6 = 1.989974874 Simplifying x + -0.6 = 1.989974874 Reorder the terms: -0.6 + x = 1.989974874 Solving -0.6 + x = 1.989974874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = 1.989974874 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = 1.989974874 + 0.6 x = 1.989974874 + 0.6 Combine like terms: 1.989974874 + 0.6 = 2.589974874 x = 2.589974874 Simplifying x = 2.589974874

Subproblem 2

x + -0.6 = -1.989974874 Simplifying x + -0.6 = -1.989974874 Reorder the terms: -0.6 + x = -1.989974874 Solving -0.6 + x = -1.989974874 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + x = -1.989974874 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + x = -1.989974874 + 0.6 x = -1.989974874 + 0.6 Combine like terms: -1.989974874 + 0.6 = -1.389974874 x = -1.389974874 Simplifying x = -1.389974874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.589974874, -1.389974874}

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