12x^2-35x-18=0

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Solution for 12x^2-35x-18=0 equation:


Simplifying
12x2 + -35x + -18 = 0

Reorder the terms:
-18 + -35x + 12x2 = 0

Solving
-18 + -35x + 12x2 = 0

Solving for variable 'x'.

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

Divide each side by '12'.
-1.5 + -2.916666667x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -2.916666667x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -2.916666667x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -2.916666667x + x2 = 0 + 1.5
-2.916666667x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-2.916666667x + x2 = 1.5

The x term is -2.916666667x.  Take half its coefficient (-1.458333334).
Square it (2.126736113) and add it to both sides.

Add '2.126736113' to each side of the equation.
-2.916666667x + 2.126736113 + x2 = 1.5 + 2.126736113

Reorder the terms:
2.126736113 + -2.916666667x + x2 = 1.5 + 2.126736113

Combine like terms: 1.5 + 2.126736113 = 3.626736113
2.126736113 + -2.916666667x + x2 = 3.626736113

Factor a perfect square on the left side:
(x + -1.458333334)(x + -1.458333334) = 3.626736113

Calculate the square root of the right side: 1.904399148

Break this problem into two subproblems by setting 
(x + -1.458333334) equal to 1.904399148 and -1.904399148.

Subproblem 1

x + -1.458333334 = 1.904399148 Simplifying x + -1.458333334 = 1.904399148 Reorder the terms: -1.458333334 + x = 1.904399148 Solving -1.458333334 + x = 1.904399148 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.458333334' to each side of the equation. -1.458333334 + 1.458333334 + x = 1.904399148 + 1.458333334 Combine like terms: -1.458333334 + 1.458333334 = 0.000000000 0.000000000 + x = 1.904399148 + 1.458333334 x = 1.904399148 + 1.458333334 Combine like terms: 1.904399148 + 1.458333334 = 3.362732482 x = 3.362732482 Simplifying x = 3.362732482

Subproblem 2

x + -1.458333334 = -1.904399148 Simplifying x + -1.458333334 = -1.904399148 Reorder the terms: -1.458333334 + x = -1.904399148 Solving -1.458333334 + x = -1.904399148 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.458333334' to each side of the equation. -1.458333334 + 1.458333334 + x = -1.904399148 + 1.458333334 Combine like terms: -1.458333334 + 1.458333334 = 0.000000000 0.000000000 + x = -1.904399148 + 1.458333334 x = -1.904399148 + 1.458333334 Combine like terms: -1.904399148 + 1.458333334 = -0.446065814 x = -0.446065814 Simplifying x = -0.446065814

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.362732482, -0.446065814}

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