(6x+2)(x-3)=9

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Solution for (6x+2)(x-3)=9 equation:


Simplifying
(6x + 2)(x + -3) = 9

Reorder the terms:
(2 + 6x)(x + -3) = 9

Reorder the terms:
(2 + 6x)(-3 + x) = 9

Multiply (2 + 6x) * (-3 + x)
(2(-3 + x) + 6x * (-3 + x)) = 9
((-3 * 2 + x * 2) + 6x * (-3 + x)) = 9
((-6 + 2x) + 6x * (-3 + x)) = 9
(-6 + 2x + (-3 * 6x + x * 6x)) = 9
(-6 + 2x + (-18x + 6x2)) = 9

Combine like terms: 2x + -18x = -16x
(-6 + -16x + 6x2) = 9

Solving
-6 + -16x + 6x2 = 9

Solving for variable 'x'.

Reorder the terms:
-6 + -9 + -16x + 6x2 = 9 + -9

Combine like terms: -6 + -9 = -15
-15 + -16x + 6x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-15 + -16x + 6x2 = 0

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

Divide each side by '6'.
-2.5 + -2.666666667x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -2.666666667x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -2.666666667x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -2.666666667x + x2 = 0 + 2.5
-2.666666667x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-2.666666667x + x2 = 2.5

The x term is -2.666666667x.  Take half its coefficient (-1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
-2.666666667x + 1.777777780 + x2 = 2.5 + 1.777777780

Reorder the terms:
1.777777780 + -2.666666667x + x2 = 2.5 + 1.777777780

Combine like terms: 2.5 + 1.777777780 = 4.27777778
1.777777780 + -2.666666667x + x2 = 4.27777778

Factor a perfect square on the left side:
(x + -1.333333334)(x + -1.333333334) = 4.27777778

Calculate the square root of the right side: 2.068278942

Break this problem into two subproblems by setting 
(x + -1.333333334) equal to 2.068278942 and -2.068278942.

Subproblem 1

x + -1.333333334 = 2.068278942 Simplifying x + -1.333333334 = 2.068278942 Reorder the terms: -1.333333334 + x = 2.068278942 Solving -1.333333334 + x = 2.068278942 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = 2.068278942 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = 2.068278942 + 1.333333334 x = 2.068278942 + 1.333333334 Combine like terms: 2.068278942 + 1.333333334 = 3.401612276 x = 3.401612276 Simplifying x = 3.401612276

Subproblem 2

x + -1.333333334 = -2.068278942 Simplifying x + -1.333333334 = -2.068278942 Reorder the terms: -1.333333334 + x = -2.068278942 Solving -1.333333334 + x = -2.068278942 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + x = -2.068278942 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + x = -2.068278942 + 1.333333334 x = -2.068278942 + 1.333333334 Combine like terms: -2.068278942 + 1.333333334 = -0.734945608 x = -0.734945608 Simplifying x = -0.734945608

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.401612276, -0.734945608}

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