x^2+3x-12x-36=18

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Solution for x^2+3x-12x-36=18 equation:


Simplifying
x2 + 3x + -12x + -36 = 18

Reorder the terms:
-36 + 3x + -12x + x2 = 18

Combine like terms: 3x + -12x = -9x
-36 + -9x + x2 = 18

Solving
-36 + -9x + x2 = 18

Solving for variable 'x'.

Reorder the terms:
-36 + -18 + -9x + x2 = 18 + -18

Combine like terms: -36 + -18 = -54
-54 + -9x + x2 = 18 + -18

Combine like terms: 18 + -18 = 0
-54 + -9x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '54' to each side of the equation.
-54 + -9x + 54 + x2 = 0 + 54

Reorder the terms:
-54 + 54 + -9x + x2 = 0 + 54

Combine like terms: -54 + 54 = 0
0 + -9x + x2 = 0 + 54
-9x + x2 = 0 + 54

Combine like terms: 0 + 54 = 54
-9x + x2 = 54

The x term is -9x.  Take half its coefficient (-4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
-9x + 20.25 + x2 = 54 + 20.25

Reorder the terms:
20.25 + -9x + x2 = 54 + 20.25

Combine like terms: 54 + 20.25 = 74.25
20.25 + -9x + x2 = 74.25

Factor a perfect square on the left side:
(x + -4.5)(x + -4.5) = 74.25

Calculate the square root of the right side: 8.61684397

Break this problem into two subproblems by setting 
(x + -4.5) equal to 8.61684397 and -8.61684397.

Subproblem 1

x + -4.5 = 8.61684397 Simplifying x + -4.5 = 8.61684397 Reorder the terms: -4.5 + x = 8.61684397 Solving -4.5 + x = 8.61684397 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = 8.61684397 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = 8.61684397 + 4.5 x = 8.61684397 + 4.5 Combine like terms: 8.61684397 + 4.5 = 13.11684397 x = 13.11684397 Simplifying x = 13.11684397

Subproblem 2

x + -4.5 = -8.61684397 Simplifying x + -4.5 = -8.61684397 Reorder the terms: -4.5 + x = -8.61684397 Solving -4.5 + x = -8.61684397 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4.5' to each side of the equation. -4.5 + 4.5 + x = -8.61684397 + 4.5 Combine like terms: -4.5 + 4.5 = 0.0 0.0 + x = -8.61684397 + 4.5 x = -8.61684397 + 4.5 Combine like terms: -8.61684397 + 4.5 = -4.11684397 x = -4.11684397 Simplifying x = -4.11684397

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.11684397, -4.11684397}

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