1.4x^2+3.3x+0.8=0

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Solution for 1.4x^2+3.3x+0.8=0 equation:


Simplifying
1.4x2 + 3.3x + 0.8 = 0

Reorder the terms:
0.8 + 3.3x + 1.4x2 = 0

Solving
0.8 + 3.3x + 1.4x2 = 0

Solving for variable 'x'.

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

Divide each side by '1.4'.
0.5714285714 + 2.357142857x + x2 = 0

Move the constant term to the right:

Add '-0.5714285714' to each side of the equation.
0.5714285714 + 2.357142857x + -0.5714285714 + x2 = 0 + -0.5714285714

Reorder the terms:
0.5714285714 + -0.5714285714 + 2.357142857x + x2 = 0 + -0.5714285714

Combine like terms: 0.5714285714 + -0.5714285714 = 0.0000000000
0.0000000000 + 2.357142857x + x2 = 0 + -0.5714285714
2.357142857x + x2 = 0 + -0.5714285714

Combine like terms: 0 + -0.5714285714 = -0.5714285714
2.357142857x + x2 = -0.5714285714

The x term is 2.357142857x.  Take half its coefficient (1.178571429).
Square it (1.389030613) and add it to both sides.

Add '1.389030613' to each side of the equation.
2.357142857x + 1.389030613 + x2 = -0.5714285714 + 1.389030613

Reorder the terms:
1.389030613 + 2.357142857x + x2 = -0.5714285714 + 1.389030613

Combine like terms: -0.5714285714 + 1.389030613 = 0.8176020416
1.389030613 + 2.357142857x + x2 = 0.8176020416

Factor a perfect square on the left side:
(x + 1.178571429)(x + 1.178571429) = 0.8176020416

Calculate the square root of the right side: 0.904213493

Break this problem into two subproblems by setting 
(x + 1.178571429) equal to 0.904213493 and -0.904213493.

Subproblem 1

x + 1.178571429 = 0.904213493 Simplifying x + 1.178571429 = 0.904213493 Reorder the terms: 1.178571429 + x = 0.904213493 Solving 1.178571429 + x = 0.904213493 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.178571429' to each side of the equation. 1.178571429 + -1.178571429 + x = 0.904213493 + -1.178571429 Combine like terms: 1.178571429 + -1.178571429 = 0.000000000 0.000000000 + x = 0.904213493 + -1.178571429 x = 0.904213493 + -1.178571429 Combine like terms: 0.904213493 + -1.178571429 = -0.274357936 x = -0.274357936 Simplifying x = -0.274357936

Subproblem 2

x + 1.178571429 = -0.904213493 Simplifying x + 1.178571429 = -0.904213493 Reorder the terms: 1.178571429 + x = -0.904213493 Solving 1.178571429 + x = -0.904213493 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.178571429' to each side of the equation. 1.178571429 + -1.178571429 + x = -0.904213493 + -1.178571429 Combine like terms: 1.178571429 + -1.178571429 = 0.000000000 0.000000000 + x = -0.904213493 + -1.178571429 x = -0.904213493 + -1.178571429 Combine like terms: -0.904213493 + -1.178571429 = -2.082784922 x = -2.082784922 Simplifying x = -2.082784922

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.274357936, -2.082784922}

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