-1.2x^2-4x+3.2=1.1

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Solution for -1.2x^2-4x+3.2=1.1 equation:


Simplifying
-1.2x2 + -4x + 3.2 = 1.1

Reorder the terms:
3.2 + -4x + -1.2x2 = 1.1

Solving
3.2 + -4x + -1.2x2 = 1.1

Solving for variable 'x'.

Reorder the terms:
3.2 + -1.1 + -4x + -1.2x2 = 1.1 + -1.1

Combine like terms: 3.2 + -1.1 = 2.1
2.1 + -4x + -1.2x2 = 1.1 + -1.1

Combine like terms: 1.1 + -1.1 = 0.0
2.1 + -4x + -1.2x2 = 0.0

Begin completing the square.  Divide all terms by
-1.2 the coefficient of the squared term: 

Divide each side by '-1.2'.
-1.75 + 3.333333333x + x2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + 3.333333333x + 1.75 + x2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + 3.333333333x + x2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + 3.333333333x + x2 = 0 + 1.75
3.333333333x + x2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
3.333333333x + x2 = 1.75

The x term is 3.333333333x.  Take half its coefficient (1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
3.333333333x + 2.777777779 + x2 = 1.75 + 2.777777779

Reorder the terms:
2.777777779 + 3.333333333x + x2 = 1.75 + 2.777777779

Combine like terms: 1.75 + 2.777777779 = 4.527777779
2.777777779 + 3.333333333x + x2 = 4.527777779

Factor a perfect square on the left side:
(x + 1.666666667)(x + 1.666666667) = 4.527777779

Calculate the square root of the right side: 2.127857556

Break this problem into two subproblems by setting 
(x + 1.666666667) equal to 2.127857556 and -2.127857556.

Subproblem 1

x + 1.666666667 = 2.127857556 Simplifying x + 1.666666667 = 2.127857556 Reorder the terms: 1.666666667 + x = 2.127857556 Solving 1.666666667 + x = 2.127857556 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.666666667' to each side of the equation. 1.666666667 + -1.666666667 + x = 2.127857556 + -1.666666667 Combine like terms: 1.666666667 + -1.666666667 = 0.000000000 0.000000000 + x = 2.127857556 + -1.666666667 x = 2.127857556 + -1.666666667 Combine like terms: 2.127857556 + -1.666666667 = 0.461190889 x = 0.461190889 Simplifying x = 0.461190889

Subproblem 2

x + 1.666666667 = -2.127857556 Simplifying x + 1.666666667 = -2.127857556 Reorder the terms: 1.666666667 + x = -2.127857556 Solving 1.666666667 + x = -2.127857556 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.666666667' to each side of the equation. 1.666666667 + -1.666666667 + x = -2.127857556 + -1.666666667 Combine like terms: 1.666666667 + -1.666666667 = 0.000000000 0.000000000 + x = -2.127857556 + -1.666666667 x = -2.127857556 + -1.666666667 Combine like terms: -2.127857556 + -1.666666667 = -3.794524223 x = -3.794524223 Simplifying x = -3.794524223

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.461190889, -3.794524223}

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