12x-2x^2=9

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Solution for 12x-2x^2=9 equation:


Simplifying
12x + -2x2 = 9

Solving
12x + -2x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + 12x + -2x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + 12x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
4.5 + -6x + x2 = 0

Move the constant term to the right:

Add '-4.5' to each side of the equation.
4.5 + -6x + -4.5 + x2 = 0 + -4.5

Reorder the terms:
4.5 + -4.5 + -6x + x2 = 0 + -4.5

Combine like terms: 4.5 + -4.5 = 0.0
0.0 + -6x + x2 = 0 + -4.5
-6x + x2 = 0 + -4.5

Combine like terms: 0 + -4.5 = -4.5
-6x + x2 = -4.5

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = -4.5 + 9

Reorder the terms:
9 + -6x + x2 = -4.5 + 9

Combine like terms: -4.5 + 9 = 4.5
9 + -6x + x2 = 4.5

Factor a perfect square on the left side:
(x + -3)(x + -3) = 4.5

Calculate the square root of the right side: 2.121320344

Break this problem into two subproblems by setting 
(x + -3) equal to 2.121320344 and -2.121320344.

Subproblem 1

x + -3 = 2.121320344 Simplifying x + -3 = 2.121320344 Reorder the terms: -3 + x = 2.121320344 Solving -3 + x = 2.121320344 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 2.121320344 + 3 Combine like terms: -3 + 3 = 0 0 + x = 2.121320344 + 3 x = 2.121320344 + 3 Combine like terms: 2.121320344 + 3 = 5.121320344 x = 5.121320344 Simplifying x = 5.121320344

Subproblem 2

x + -3 = -2.121320344 Simplifying x + -3 = -2.121320344 Reorder the terms: -3 + x = -2.121320344 Solving -3 + x = -2.121320344 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -2.121320344 + 3 Combine like terms: -3 + 3 = 0 0 + x = -2.121320344 + 3 x = -2.121320344 + 3 Combine like terms: -2.121320344 + 3 = 0.878679656 x = 0.878679656 Simplifying x = 0.878679656

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.121320344, 0.878679656}

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