3(x^2-9)=2x

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Solution for 3(x^2-9)=2x equation:


Simplifying
3(x2 + -9) = 2x

Reorder the terms:
3(-9 + x2) = 2x
(-9 * 3 + x2 * 3) = 2x
(-27 + 3x2) = 2x

Solving
-27 + 3x2 = 2x

Solving for variable 'x'.

Reorder the terms:
-27 + -2x + 3x2 = 2x + -2x

Combine like terms: 2x + -2x = 0
-27 + -2x + 3x2 = 0

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

Divide each side by '3'.
-9 + -0.6666666667x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -0.6666666667x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -0.6666666667x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -0.6666666667x + x2 = 0 + 9
-0.6666666667x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-0.6666666667x + x2 = 9

The x term is -0.6666666667x.  Take half its coefficient (-0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
-0.6666666667x + 0.1111111112 + x2 = 9 + 0.1111111112

Reorder the terms:
0.1111111112 + -0.6666666667x + x2 = 9 + 0.1111111112

Combine like terms: 9 + 0.1111111112 = 9.1111111112
0.1111111112 + -0.6666666667x + x2 = 9.1111111112

Factor a perfect square on the left side:
(x + -0.3333333334)(x + -0.3333333334) = 9.1111111112

Calculate the square root of the right side: 3.018461713

Break this problem into two subproblems by setting 
(x + -0.3333333334) equal to 3.018461713 and -3.018461713.

Subproblem 1

x + -0.3333333334 = 3.018461713 Simplifying x + -0.3333333334 = 3.018461713 Reorder the terms: -0.3333333334 + x = 3.018461713 Solving -0.3333333334 + x = 3.018461713 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = 3.018461713 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = 3.018461713 + 0.3333333334 x = 3.018461713 + 0.3333333334 Combine like terms: 3.018461713 + 0.3333333334 = 3.3517950464 x = 3.3517950464 Simplifying x = 3.3517950464

Subproblem 2

x + -0.3333333334 = -3.018461713 Simplifying x + -0.3333333334 = -3.018461713 Reorder the terms: -0.3333333334 + x = -3.018461713 Solving -0.3333333334 + x = -3.018461713 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3333333334' to each side of the equation. -0.3333333334 + 0.3333333334 + x = -3.018461713 + 0.3333333334 Combine like terms: -0.3333333334 + 0.3333333334 = 0.0000000000 0.0000000000 + x = -3.018461713 + 0.3333333334 x = -3.018461713 + 0.3333333334 Combine like terms: -3.018461713 + 0.3333333334 = -2.6851283796 x = -2.6851283796 Simplifying x = -2.6851283796

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.3517950464, -2.6851283796}

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