3x(2x-9)+(2x-9)=360

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Solution for 3x(2x-9)+(2x-9)=360 equation:


Simplifying
3x(2x + -9) + (2x + -9) = 360

Reorder the terms:
3x(-9 + 2x) + (2x + -9) = 360
(-9 * 3x + 2x * 3x) + (2x + -9) = 360
(-27x + 6x2) + (2x + -9) = 360

Reorder the terms:
-27x + 6x2 + (-9 + 2x) = 360

Remove parenthesis around (-9 + 2x)
-27x + 6x2 + -9 + 2x = 360

Reorder the terms:
-9 + -27x + 2x + 6x2 = 360

Combine like terms: -27x + 2x = -25x
-9 + -25x + 6x2 = 360

Solving
-9 + -25x + 6x2 = 360

Solving for variable 'x'.

Reorder the terms:
-9 + -360 + -25x + 6x2 = 360 + -360

Combine like terms: -9 + -360 = -369
-369 + -25x + 6x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-369 + -25x + 6x2 = 0

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

Divide each side by '6'.
-61.5 + -4.166666667x + x2 = 0

Move the constant term to the right:

Add '61.5' to each side of the equation.
-61.5 + -4.166666667x + 61.5 + x2 = 0 + 61.5

Reorder the terms:
-61.5 + 61.5 + -4.166666667x + x2 = 0 + 61.5

Combine like terms: -61.5 + 61.5 = 0.0
0.0 + -4.166666667x + x2 = 0 + 61.5
-4.166666667x + x2 = 0 + 61.5

Combine like terms: 0 + 61.5 = 61.5
-4.166666667x + x2 = 61.5

The x term is -4.166666667x.  Take half its coefficient (-2.083333334).
Square it (4.340277781) and add it to both sides.

Add '4.340277781' to each side of the equation.
-4.166666667x + 4.340277781 + x2 = 61.5 + 4.340277781

Reorder the terms:
4.340277781 + -4.166666667x + x2 = 61.5 + 4.340277781

Combine like terms: 61.5 + 4.340277781 = 65.840277781
4.340277781 + -4.166666667x + x2 = 65.840277781

Factor a perfect square on the left side:
(x + -2.083333334)(x + -2.083333334) = 65.840277781

Calculate the square root of the right side: 8.114202227

Break this problem into two subproblems by setting 
(x + -2.083333334) equal to 8.114202227 and -8.114202227.

Subproblem 1

x + -2.083333334 = 8.114202227 Simplifying x + -2.083333334 = 8.114202227 Reorder the terms: -2.083333334 + x = 8.114202227 Solving -2.083333334 + x = 8.114202227 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.083333334' to each side of the equation. -2.083333334 + 2.083333334 + x = 8.114202227 + 2.083333334 Combine like terms: -2.083333334 + 2.083333334 = 0.000000000 0.000000000 + x = 8.114202227 + 2.083333334 x = 8.114202227 + 2.083333334 Combine like terms: 8.114202227 + 2.083333334 = 10.197535561 x = 10.197535561 Simplifying x = 10.197535561

Subproblem 2

x + -2.083333334 = -8.114202227 Simplifying x + -2.083333334 = -8.114202227 Reorder the terms: -2.083333334 + x = -8.114202227 Solving -2.083333334 + x = -8.114202227 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.083333334' to each side of the equation. -2.083333334 + 2.083333334 + x = -8.114202227 + 2.083333334 Combine like terms: -2.083333334 + 2.083333334 = 0.000000000 0.000000000 + x = -8.114202227 + 2.083333334 x = -8.114202227 + 2.083333334 Combine like terms: -8.114202227 + 2.083333334 = -6.030868893 x = -6.030868893 Simplifying x = -6.030868893

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.197535561, -6.030868893}

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