9x^2+9x-124=0

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Solution for 9x^2+9x-124=0 equation:


Simplifying
9x2 + 9x + -124 = 0

Reorder the terms:
-124 + 9x + 9x2 = 0

Solving
-124 + 9x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-13.77777778 + x + x2 = 0

Move the constant term to the right:

Add '13.77777778' to each side of the equation.
-13.77777778 + x + 13.77777778 + x2 = 0 + 13.77777778

Reorder the terms:
-13.77777778 + 13.77777778 + x + x2 = 0 + 13.77777778

Combine like terms: -13.77777778 + 13.77777778 = 0.00000000
0.00000000 + x + x2 = 0 + 13.77777778
x + x2 = 0 + 13.77777778

Combine like terms: 0 + 13.77777778 = 13.77777778
x + x2 = 13.77777778

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + x2 = 13.77777778 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + x2 = 13.77777778 + 0.25

Combine like terms: 13.77777778 + 0.25 = 14.02777778
1.25 + x2 = 14.02777778

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 14.02777778

Calculate the square root of the right side: 3.745367509

Break this problem into two subproblems by setting 
(x + 0.5) equal to 3.745367509 and -3.745367509.

Subproblem 1

x + 0.5 = 3.745367509 Simplifying x + 0.5 = 3.745367509 Reorder the terms: 0.5 + x = 3.745367509 Solving 0.5 + x = 3.745367509 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 3.745367509 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 3.745367509 + -0.5 x = 3.745367509 + -0.5 Combine like terms: 3.745367509 + -0.5 = 3.245367509 x = 3.245367509 Simplifying x = 3.245367509

Subproblem 2

x + 0.5 = -3.745367509 Simplifying x + 0.5 = -3.745367509 Reorder the terms: 0.5 + x = -3.745367509 Solving 0.5 + x = -3.745367509 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -3.745367509 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -3.745367509 + -0.5 x = -3.745367509 + -0.5 Combine like terms: -3.745367509 + -0.5 = -4.245367509 x = -4.245367509 Simplifying x = -4.245367509

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.245367509, -4.245367509}

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