0=0.6*(x^2)+2.8*x+0.6

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Solution for 0=0.6*(x^2)+2.8*x+0.6 equation:


Simplifying
0 = 0.6(x2) + 2.8x + 0.6

Reorder the terms:
0 = 0.6 + 2.8x + 0.6x2

Solving
0 = 0.6 + 2.8x + 0.6x2

Solving for variable 'x'.

Combine like terms: 0 + -0.6 = -0.6
-0.6 + -2.8x + -0.6x2 = 0.6 + 2.8x + 0.6x2 + -0.6 + -2.8x + -0.6x2

Reorder the terms:
-0.6 + -2.8x + -0.6x2 = 0.6 + -0.6 + 2.8x + -2.8x + 0.6x2 + -0.6x2

Combine like terms: 0.6 + -0.6 = 0.0
-0.6 + -2.8x + -0.6x2 = 0.0 + 2.8x + -2.8x + 0.6x2 + -0.6x2
-0.6 + -2.8x + -0.6x2 = 2.8x + -2.8x + 0.6x2 + -0.6x2

Combine like terms: 2.8x + -2.8x = 0.0
-0.6 + -2.8x + -0.6x2 = 0.0 + 0.6x2 + -0.6x2
-0.6 + -2.8x + -0.6x2 = 0.6x2 + -0.6x2

Combine like terms: 0.6x2 + -0.6x2 = 0.0
-0.6 + -2.8x + -0.6x2 = 0.0

Begin completing the square.  Divide all terms by
-0.6 the coefficient of the squared term: 

Divide each side by '-0.6'.
1 + 4.666666667x + x2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + 4.666666667x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + 4.666666667x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 4.666666667x + x2 = 0 + -1
4.666666667x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
4.666666667x + x2 = -1

The x term is 4.666666667x.  Take half its coefficient (2.333333334).
Square it (5.444444448) and add it to both sides.

Add '5.444444448' to each side of the equation.
4.666666667x + 5.444444448 + x2 = -1 + 5.444444448

Reorder the terms:
5.444444448 + 4.666666667x + x2 = -1 + 5.444444448

Combine like terms: -1 + 5.444444448 = 4.444444448
5.444444448 + 4.666666667x + x2 = 4.444444448

Factor a perfect square on the left side:
(x + 2.333333334)(x + 2.333333334) = 4.444444448

Calculate the square root of the right side: 2.108185108

Break this problem into two subproblems by setting 
(x + 2.333333334) equal to 2.108185108 and -2.108185108.

Subproblem 1

x + 2.333333334 = 2.108185108 Simplifying x + 2.333333334 = 2.108185108 Reorder the terms: 2.333333334 + x = 2.108185108 Solving 2.333333334 + x = 2.108185108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.333333334' to each side of the equation. 2.333333334 + -2.333333334 + x = 2.108185108 + -2.333333334 Combine like terms: 2.333333334 + -2.333333334 = 0.000000000 0.000000000 + x = 2.108185108 + -2.333333334 x = 2.108185108 + -2.333333334 Combine like terms: 2.108185108 + -2.333333334 = -0.225148226 x = -0.225148226 Simplifying x = -0.225148226

Subproblem 2

x + 2.333333334 = -2.108185108 Simplifying x + 2.333333334 = -2.108185108 Reorder the terms: 2.333333334 + x = -2.108185108 Solving 2.333333334 + x = -2.108185108 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.333333334' to each side of the equation. 2.333333334 + -2.333333334 + x = -2.108185108 + -2.333333334 Combine like terms: 2.333333334 + -2.333333334 = 0.000000000 0.000000000 + x = -2.108185108 + -2.333333334 x = -2.108185108 + -2.333333334 Combine like terms: -2.108185108 + -2.333333334 = -4.441518442 x = -4.441518442 Simplifying x = -4.441518442

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.225148226, -4.441518442}

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