2.6x(x-2)+3x=1.2

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Solution for 2.6x(x-2)+3x=1.2 equation:


Simplifying
2.6x(x + -2) + 3x = 1.2

Reorder the terms:
2.6x(-2 + x) + 3x = 1.2
(-2 * 2.6x + x * 2.6x) + 3x = 1.2
(-5.2x + 2.6x2) + 3x = 1.2

Reorder the terms:
-5.2x + 3x + 2.6x2 = 1.2

Combine like terms: -5.2x + 3x = -2.2x
-2.2x + 2.6x2 = 1.2

Solving
-2.2x + 2.6x2 = 1.2

Solving for variable 'x'.

Reorder the terms:
-1.2 + -2.2x + 2.6x2 = 1.2 + -1.2

Combine like terms: 1.2 + -1.2 = 0.0
-1.2 + -2.2x + 2.6x2 = 0.0

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

Divide each side by '2.6'.
-0.4615384615 + -0.8461538462x + x2 = 0

Move the constant term to the right:

Add '0.4615384615' to each side of the equation.
-0.4615384615 + -0.8461538462x + 0.4615384615 + x2 = 0 + 0.4615384615

Reorder the terms:
-0.4615384615 + 0.4615384615 + -0.8461538462x + x2 = 0 + 0.4615384615

Combine like terms: -0.4615384615 + 0.4615384615 = 0.0000000000
0.0000000000 + -0.8461538462x + x2 = 0 + 0.4615384615
-0.8461538462x + x2 = 0 + 0.4615384615

Combine like terms: 0 + 0.4615384615 = 0.4615384615
-0.8461538462x + x2 = 0.4615384615

The x term is -0.8461538462x.  Take half its coefficient (-0.4230769231).
Square it (0.1789940829) and add it to both sides.

Add '0.1789940829' to each side of the equation.
-0.8461538462x + 0.1789940829 + x2 = 0.4615384615 + 0.1789940829

Reorder the terms:
0.1789940829 + -0.8461538462x + x2 = 0.4615384615 + 0.1789940829

Combine like terms: 0.4615384615 + 0.1789940829 = 0.6405325444
0.1789940829 + -0.8461538462x + x2 = 0.6405325444

Factor a perfect square on the left side:
(x + -0.4230769231)(x + -0.4230769231) = 0.6405325444

Calculate the square root of the right side: 0.800332771

Break this problem into two subproblems by setting 
(x + -0.4230769231) equal to 0.800332771 and -0.800332771.

Subproblem 1

x + -0.4230769231 = 0.800332771 Simplifying x + -0.4230769231 = 0.800332771 Reorder the terms: -0.4230769231 + x = 0.800332771 Solving -0.4230769231 + x = 0.800332771 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4230769231' to each side of the equation. -0.4230769231 + 0.4230769231 + x = 0.800332771 + 0.4230769231 Combine like terms: -0.4230769231 + 0.4230769231 = 0.0000000000 0.0000000000 + x = 0.800332771 + 0.4230769231 x = 0.800332771 + 0.4230769231 Combine like terms: 0.800332771 + 0.4230769231 = 1.2234096941 x = 1.2234096941 Simplifying x = 1.2234096941

Subproblem 2

x + -0.4230769231 = -0.800332771 Simplifying x + -0.4230769231 = -0.800332771 Reorder the terms: -0.4230769231 + x = -0.800332771 Solving -0.4230769231 + x = -0.800332771 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.4230769231' to each side of the equation. -0.4230769231 + 0.4230769231 + x = -0.800332771 + 0.4230769231 Combine like terms: -0.4230769231 + 0.4230769231 = 0.0000000000 0.0000000000 + x = -0.800332771 + 0.4230769231 x = -0.800332771 + 0.4230769231 Combine like terms: -0.800332771 + 0.4230769231 = -0.3772558479 x = -0.3772558479 Simplifying x = -0.3772558479

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.2234096941, -0.3772558479}

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