3.25x^2-12x=9

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Solution for 3.25x^2-12x=9 equation:


Simplifying
3.25x2 + -12x = 9

Reorder the terms:
-12x + 3.25x2 = 9

Solving
-12x + 3.25x2 = 9

Solving for variable 'x'.

Reorder the terms:
-9 + -12x + 3.25x2 = 9 + -9

Combine like terms: 9 + -9 = 0
-9 + -12x + 3.25x2 = 0

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

Divide each side by '3.25'.
-2.769230769 + -3.692307692x + x2 = 0

Move the constant term to the right:

Add '2.769230769' to each side of the equation.
-2.769230769 + -3.692307692x + 2.769230769 + x2 = 0 + 2.769230769

Reorder the terms:
-2.769230769 + 2.769230769 + -3.692307692x + x2 = 0 + 2.769230769

Combine like terms: -2.769230769 + 2.769230769 = 0.000000000
0.000000000 + -3.692307692x + x2 = 0 + 2.769230769
-3.692307692x + x2 = 0 + 2.769230769

Combine like terms: 0 + 2.769230769 = 2.769230769
-3.692307692x + x2 = 2.769230769

The x term is -3.692307692x.  Take half its coefficient (-1.846153846).
Square it (3.408284023) and add it to both sides.

Add '3.408284023' to each side of the equation.
-3.692307692x + 3.408284023 + x2 = 2.769230769 + 3.408284023

Reorder the terms:
3.408284023 + -3.692307692x + x2 = 2.769230769 + 3.408284023

Combine like terms: 2.769230769 + 3.408284023 = 6.177514792
3.408284023 + -3.692307692x + x2 = 6.177514792

Factor a perfect square on the left side:
(x + -1.846153846)(x + -1.846153846) = 6.177514792

Calculate the square root of the right side: 2.48546068

Break this problem into two subproblems by setting 
(x + -1.846153846) equal to 2.48546068 and -2.48546068.

Subproblem 1

x + -1.846153846 = 2.48546068 Simplifying x + -1.846153846 = 2.48546068 Reorder the terms: -1.846153846 + x = 2.48546068 Solving -1.846153846 + x = 2.48546068 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.846153846' to each side of the equation. -1.846153846 + 1.846153846 + x = 2.48546068 + 1.846153846 Combine like terms: -1.846153846 + 1.846153846 = 0.000000000 0.000000000 + x = 2.48546068 + 1.846153846 x = 2.48546068 + 1.846153846 Combine like terms: 2.48546068 + 1.846153846 = 4.331614526 x = 4.331614526 Simplifying x = 4.331614526

Subproblem 2

x + -1.846153846 = -2.48546068 Simplifying x + -1.846153846 = -2.48546068 Reorder the terms: -1.846153846 + x = -2.48546068 Solving -1.846153846 + x = -2.48546068 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.846153846' to each side of the equation. -1.846153846 + 1.846153846 + x = -2.48546068 + 1.846153846 Combine like terms: -1.846153846 + 1.846153846 = 0.000000000 0.000000000 + x = -2.48546068 + 1.846153846 x = -2.48546068 + 1.846153846 Combine like terms: -2.48546068 + 1.846153846 = -0.639306834 x = -0.639306834 Simplifying x = -0.639306834

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.331614526, -0.639306834}

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