2.6x^2=4-3.5x

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Solution for 2.6x^2=4-3.5x equation:


Simplifying
2.6x2 = 4 + -3.5x

Solving
2.6x2 = 4 + -3.5x

Solving for variable 'x'.

Reorder the terms:
-4 + 3.5x + 2.6x2 = 4 + -3.5x + -4 + 3.5x

Reorder the terms:
-4 + 3.5x + 2.6x2 = 4 + -4 + -3.5x + 3.5x

Combine like terms: 4 + -4 = 0
-4 + 3.5x + 2.6x2 = 0 + -3.5x + 3.5x
-4 + 3.5x + 2.6x2 = -3.5x + 3.5x

Combine like terms: -3.5x + 3.5x = 0.0
-4 + 3.5x + 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'.
-1.538461538 + 1.346153846x + x2 = 0

Move the constant term to the right:

Add '1.538461538' to each side of the equation.
-1.538461538 + 1.346153846x + 1.538461538 + x2 = 0 + 1.538461538

Reorder the terms:
-1.538461538 + 1.538461538 + 1.346153846x + x2 = 0 + 1.538461538

Combine like terms: -1.538461538 + 1.538461538 = 0.000000000
0.000000000 + 1.346153846x + x2 = 0 + 1.538461538
1.346153846x + x2 = 0 + 1.538461538

Combine like terms: 0 + 1.538461538 = 1.538461538
1.346153846x + x2 = 1.538461538

The x term is 1.346153846x.  Take half its coefficient (0.673076923).
Square it (0.4530325443) and add it to both sides.

Add '0.4530325443' to each side of the equation.
1.346153846x + 0.4530325443 + x2 = 1.538461538 + 0.4530325443

Reorder the terms:
0.4530325443 + 1.346153846x + x2 = 1.538461538 + 0.4530325443

Combine like terms: 1.538461538 + 0.4530325443 = 1.9914940823
0.4530325443 + 1.346153846x + x2 = 1.9914940823

Factor a perfect square on the left side:
(x + 0.673076923)(x + 0.673076923) = 1.9914940823

Calculate the square root of the right side: 1.411203062

Break this problem into two subproblems by setting 
(x + 0.673076923) equal to 1.411203062 and -1.411203062.

Subproblem 1

x + 0.673076923 = 1.411203062 Simplifying x + 0.673076923 = 1.411203062 Reorder the terms: 0.673076923 + x = 1.411203062 Solving 0.673076923 + x = 1.411203062 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.673076923' to each side of the equation. 0.673076923 + -0.673076923 + x = 1.411203062 + -0.673076923 Combine like terms: 0.673076923 + -0.673076923 = 0.000000000 0.000000000 + x = 1.411203062 + -0.673076923 x = 1.411203062 + -0.673076923 Combine like terms: 1.411203062 + -0.673076923 = 0.738126139 x = 0.738126139 Simplifying x = 0.738126139

Subproblem 2

x + 0.673076923 = -1.411203062 Simplifying x + 0.673076923 = -1.411203062 Reorder the terms: 0.673076923 + x = -1.411203062 Solving 0.673076923 + x = -1.411203062 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.673076923' to each side of the equation. 0.673076923 + -0.673076923 + x = -1.411203062 + -0.673076923 Combine like terms: 0.673076923 + -0.673076923 = 0.000000000 0.000000000 + x = -1.411203062 + -0.673076923 x = -1.411203062 + -0.673076923 Combine like terms: -1.411203062 + -0.673076923 = -2.084279985 x = -2.084279985 Simplifying x = -2.084279985

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.738126139, -2.084279985}

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