12x^2=5x+9

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Solution for 12x^2=5x+9 equation:


Simplifying
12x2 = 5x + 9

Reorder the terms:
12x2 = 9 + 5x

Solving
12x2 = 9 + 5x

Solving for variable 'x'.

Reorder the terms:
-9 + -5x + 12x2 = 9 + 5x + -9 + -5x

Reorder the terms:
-9 + -5x + 12x2 = 9 + -9 + 5x + -5x

Combine like terms: 9 + -9 = 0
-9 + -5x + 12x2 = 0 + 5x + -5x
-9 + -5x + 12x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-9 + -5x + 12x2 = 0

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

Divide each side by '12'.
-0.75 + -0.4166666667x + x2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + -0.4166666667x + 0.75 + x2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + -0.4166666667x + x2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + -0.4166666667x + x2 = 0 + 0.75
-0.4166666667x + x2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
-0.4166666667x + x2 = 0.75

The x term is -0.4166666667x.  Take half its coefficient (-0.2083333334).
Square it (0.04340277781) and add it to both sides.

Add '0.04340277781' to each side of the equation.
-0.4166666667x + 0.04340277781 + x2 = 0.75 + 0.04340277781

Reorder the terms:
0.04340277781 + -0.4166666667x + x2 = 0.75 + 0.04340277781

Combine like terms: 0.75 + 0.04340277781 = 0.79340277781
0.04340277781 + -0.4166666667x + x2 = 0.79340277781

Factor a perfect square on the left side:
(x + -0.2083333334)(x + -0.2083333334) = 0.79340277781

Calculate the square root of the right side: 0.890731597

Break this problem into two subproblems by setting 
(x + -0.2083333334) equal to 0.890731597 and -0.890731597.

Subproblem 1

x + -0.2083333334 = 0.890731597 Simplifying x + -0.2083333334 = 0.890731597 Reorder the terms: -0.2083333334 + x = 0.890731597 Solving -0.2083333334 + x = 0.890731597 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2083333334' to each side of the equation. -0.2083333334 + 0.2083333334 + x = 0.890731597 + 0.2083333334 Combine like terms: -0.2083333334 + 0.2083333334 = 0.0000000000 0.0000000000 + x = 0.890731597 + 0.2083333334 x = 0.890731597 + 0.2083333334 Combine like terms: 0.890731597 + 0.2083333334 = 1.0990649304 x = 1.0990649304 Simplifying x = 1.0990649304

Subproblem 2

x + -0.2083333334 = -0.890731597 Simplifying x + -0.2083333334 = -0.890731597 Reorder the terms: -0.2083333334 + x = -0.890731597 Solving -0.2083333334 + x = -0.890731597 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.2083333334' to each side of the equation. -0.2083333334 + 0.2083333334 + x = -0.890731597 + 0.2083333334 Combine like terms: -0.2083333334 + 0.2083333334 = 0.0000000000 0.0000000000 + x = -0.890731597 + 0.2083333334 x = -0.890731597 + 0.2083333334 Combine like terms: -0.890731597 + 0.2083333334 = -0.6823982636 x = -0.6823982636 Simplifying x = -0.6823982636

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.0990649304, -0.6823982636}

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