x(12x-84)=-113

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Solution for x(12x-84)=-113 equation:


Simplifying
x(12x + -84) = -113

Reorder the terms:
x(-84 + 12x) = -113
(-84 * x + 12x * x) = -113
(-84x + 12x2) = -113

Solving
-84x + 12x2 = -113

Solving for variable 'x'.

Reorder the terms:
113 + -84x + 12x2 = -113 + 113

Combine like terms: -113 + 113 = 0
113 + -84x + 12x2 = 0

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

Divide each side by '12'.
9.416666667 + -7x + x2 = 0

Move the constant term to the right:

Add '-9.416666667' to each side of the equation.
9.416666667 + -7x + -9.416666667 + x2 = 0 + -9.416666667

Reorder the terms:
9.416666667 + -9.416666667 + -7x + x2 = 0 + -9.416666667

Combine like terms: 9.416666667 + -9.416666667 = 0.000000000
0.000000000 + -7x + x2 = 0 + -9.416666667
-7x + x2 = 0 + -9.416666667

Combine like terms: 0 + -9.416666667 = -9.416666667
-7x + x2 = -9.416666667

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = -9.416666667 + 12.25

Reorder the terms:
12.25 + -7x + x2 = -9.416666667 + 12.25

Combine like terms: -9.416666667 + 12.25 = 2.833333333
12.25 + -7x + x2 = 2.833333333

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 2.833333333

Calculate the square root of the right side: 1.683250823

Break this problem into two subproblems by setting 
(x + -3.5) equal to 1.683250823 and -1.683250823.

Subproblem 1

x + -3.5 = 1.683250823 Simplifying x + -3.5 = 1.683250823 Reorder the terms: -3.5 + x = 1.683250823 Solving -3.5 + x = 1.683250823 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = 1.683250823 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = 1.683250823 + 3.5 x = 1.683250823 + 3.5 Combine like terms: 1.683250823 + 3.5 = 5.183250823 x = 5.183250823 Simplifying x = 5.183250823

Subproblem 2

x + -3.5 = -1.683250823 Simplifying x + -3.5 = -1.683250823 Reorder the terms: -3.5 + x = -1.683250823 Solving -3.5 + x = -1.683250823 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + x = -1.683250823 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + x = -1.683250823 + 3.5 x = -1.683250823 + 3.5 Combine like terms: -1.683250823 + 3.5 = 1.816749177 x = 1.816749177 Simplifying x = 1.816749177

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.183250823, 1.816749177}

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