x^2+3*x+9*x-8=360

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Solution for x^2+3*x+9*x-8=360 equation:


Simplifying
x2 + 3x + 9x + -8 = 360

Reorder the terms:
-8 + 3x + 9x + x2 = 360

Combine like terms: 3x + 9x = 12x
-8 + 12x + x2 = 360

Solving
-8 + 12x + x2 = 360

Solving for variable 'x'.

Reorder the terms:
-8 + -360 + 12x + x2 = 360 + -360

Combine like terms: -8 + -360 = -368
-368 + 12x + x2 = 360 + -360

Combine like terms: 360 + -360 = 0
-368 + 12x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '368' to each side of the equation.
-368 + 12x + 368 + x2 = 0 + 368

Reorder the terms:
-368 + 368 + 12x + x2 = 0 + 368

Combine like terms: -368 + 368 = 0
0 + 12x + x2 = 0 + 368
12x + x2 = 0 + 368

Combine like terms: 0 + 368 = 368
12x + x2 = 368

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 368 + 36

Reorder the terms:
36 + 12x + x2 = 368 + 36

Combine like terms: 368 + 36 = 404
36 + 12x + x2 = 404

Factor a perfect square on the left side:
(x + 6)(x + 6) = 404

Calculate the square root of the right side: 20.099751242

Break this problem into two subproblems by setting 
(x + 6) equal to 20.099751242 and -20.099751242.

Subproblem 1

x + 6 = 20.099751242 Simplifying x + 6 = 20.099751242 Reorder the terms: 6 + x = 20.099751242 Solving 6 + x = 20.099751242 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 20.099751242 + -6 Combine like terms: 6 + -6 = 0 0 + x = 20.099751242 + -6 x = 20.099751242 + -6 Combine like terms: 20.099751242 + -6 = 14.099751242 x = 14.099751242 Simplifying x = 14.099751242

Subproblem 2

x + 6 = -20.099751242 Simplifying x + 6 = -20.099751242 Reorder the terms: 6 + x = -20.099751242 Solving 6 + x = -20.099751242 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -20.099751242 + -6 Combine like terms: 6 + -6 = 0 0 + x = -20.099751242 + -6 x = -20.099751242 + -6 Combine like terms: -20.099751242 + -6 = -26.099751242 x = -26.099751242 Simplifying x = -26.099751242

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.099751242, -26.099751242}

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