9x^2+12x+125=324

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Solution for 9x^2+12x+125=324 equation:


Simplifying
9x2 + 12x + 125 = 324

Reorder the terms:
125 + 12x + 9x2 = 324

Solving
125 + 12x + 9x2 = 324

Solving for variable 'x'.

Reorder the terms:
125 + -324 + 12x + 9x2 = 324 + -324

Combine like terms: 125 + -324 = -199
-199 + 12x + 9x2 = 324 + -324

Combine like terms: 324 + -324 = 0
-199 + 12x + 9x2 = 0

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

Divide each side by '9'.
-22.11111111 + 1.333333333x + x2 = 0

Move the constant term to the right:

Add '22.11111111' to each side of the equation.
-22.11111111 + 1.333333333x + 22.11111111 + x2 = 0 + 22.11111111

Reorder the terms:
-22.11111111 + 22.11111111 + 1.333333333x + x2 = 0 + 22.11111111

Combine like terms: -22.11111111 + 22.11111111 = 0.00000000
0.00000000 + 1.333333333x + x2 = 0 + 22.11111111
1.333333333x + x2 = 0 + 22.11111111

Combine like terms: 0 + 22.11111111 = 22.11111111
1.333333333x + x2 = 22.11111111

The x term is 1.333333333x.  Take half its coefficient (0.6666666665).
Square it (0.4444444442) and add it to both sides.

Add '0.4444444442' to each side of the equation.
1.333333333x + 0.4444444442 + x2 = 22.11111111 + 0.4444444442

Reorder the terms:
0.4444444442 + 1.333333333x + x2 = 22.11111111 + 0.4444444442

Combine like terms: 22.11111111 + 0.4444444442 = 22.5555555542
0.4444444442 + 1.333333333x + x2 = 22.5555555542

Factor a perfect square on the left side:
(x + 0.6666666665)(x + 0.6666666665) = 22.5555555542

Calculate the square root of the right side: 4.749268949

Break this problem into two subproblems by setting 
(x + 0.6666666665) equal to 4.749268949 and -4.749268949.

Subproblem 1

x + 0.6666666665 = 4.749268949 Simplifying x + 0.6666666665 = 4.749268949 Reorder the terms: 0.6666666665 + x = 4.749268949 Solving 0.6666666665 + x = 4.749268949 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = 4.749268949 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = 4.749268949 + -0.6666666665 x = 4.749268949 + -0.6666666665 Combine like terms: 4.749268949 + -0.6666666665 = 4.0826022825 x = 4.0826022825 Simplifying x = 4.0826022825

Subproblem 2

x + 0.6666666665 = -4.749268949 Simplifying x + 0.6666666665 = -4.749268949 Reorder the terms: 0.6666666665 + x = -4.749268949 Solving 0.6666666665 + x = -4.749268949 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.6666666665' to each side of the equation. 0.6666666665 + -0.6666666665 + x = -4.749268949 + -0.6666666665 Combine like terms: 0.6666666665 + -0.6666666665 = 0.0000000000 0.0000000000 + x = -4.749268949 + -0.6666666665 x = -4.749268949 + -0.6666666665 Combine like terms: -4.749268949 + -0.6666666665 = -5.4159356155 x = -5.4159356155 Simplifying x = -5.4159356155

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.0826022825, -5.4159356155}

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