2x^2=3.6x+2.6

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Solution for 2x^2=3.6x+2.6 equation:


Simplifying
2x2 = 3.6x + 2.6

Reorder the terms:
2x2 = 2.6 + 3.6x

Solving
2x2 = 2.6 + 3.6x

Solving for variable 'x'.

Reorder the terms:
-2.6 + -3.6x + 2x2 = 2.6 + 3.6x + -2.6 + -3.6x

Reorder the terms:
-2.6 + -3.6x + 2x2 = 2.6 + -2.6 + 3.6x + -3.6x

Combine like terms: 2.6 + -2.6 = 0.0
-2.6 + -3.6x + 2x2 = 0.0 + 3.6x + -3.6x
-2.6 + -3.6x + 2x2 = 3.6x + -3.6x

Combine like terms: 3.6x + -3.6x = 0.0
-2.6 + -3.6x + 2x2 = 0.0

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

Divide each side by '2'.
-1.3 + -1.8x + x2 = 0.0

Move the constant term to the right:

Add '1.3' to each side of the equation.
-1.3 + -1.8x + 1.3 + x2 = 0.0 + 1.3

Reorder the terms:
-1.3 + 1.3 + -1.8x + x2 = 0.0 + 1.3

Combine like terms: -1.3 + 1.3 = 0.0
0.0 + -1.8x + x2 = 0.0 + 1.3
-1.8x + x2 = 0.0 + 1.3

Combine like terms: 0.0 + 1.3 = 1.3
-1.8x + x2 = 1.3

The x term is -1.8x.  Take half its coefficient (-0.9).
Square it (0.81) and add it to both sides.

Add '0.81' to each side of the equation.
-1.8x + 0.81 + x2 = 1.3 + 0.81

Reorder the terms:
0.81 + -1.8x + x2 = 1.3 + 0.81

Combine like terms: 1.3 + 0.81 = 2.11
0.81 + -1.8x + x2 = 2.11

Factor a perfect square on the left side:
(x + -0.9)(x + -0.9) = 2.11

Calculate the square root of the right side: 1.452583905

Break this problem into two subproblems by setting 
(x + -0.9) equal to 1.452583905 and -1.452583905.

Subproblem 1

x + -0.9 = 1.452583905 Simplifying x + -0.9 = 1.452583905 Reorder the terms: -0.9 + x = 1.452583905 Solving -0.9 + x = 1.452583905 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = 1.452583905 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = 1.452583905 + 0.9 x = 1.452583905 + 0.9 Combine like terms: 1.452583905 + 0.9 = 2.352583905 x = 2.352583905 Simplifying x = 2.352583905

Subproblem 2

x + -0.9 = -1.452583905 Simplifying x + -0.9 = -1.452583905 Reorder the terms: -0.9 + x = -1.452583905 Solving -0.9 + x = -1.452583905 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.9' to each side of the equation. -0.9 + 0.9 + x = -1.452583905 + 0.9 Combine like terms: -0.9 + 0.9 = 0.0 0.0 + x = -1.452583905 + 0.9 x = -1.452583905 + 0.9 Combine like terms: -1.452583905 + 0.9 = -0.552583905 x = -0.552583905 Simplifying x = -0.552583905

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.352583905, -0.552583905}

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