0=0.2x^2+1.2x-2.2

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Solution for 0=0.2x^2+1.2x-2.2 equation:


Simplifying
0 = 0.2x2 + 1.2x + -2.2

Reorder the terms:
0 = -2.2 + 1.2x + 0.2x2

Solving
0 = -2.2 + 1.2x + 0.2x2

Solving for variable 'x'.

Combine like terms: 0 + 2.2 = 2.2
2.2 + -1.2x + -0.2x2 = -2.2 + 1.2x + 0.2x2 + 2.2 + -1.2x + -0.2x2

Reorder the terms:
2.2 + -1.2x + -0.2x2 = -2.2 + 2.2 + 1.2x + -1.2x + 0.2x2 + -0.2x2

Combine like terms: -2.2 + 2.2 = 0.0
2.2 + -1.2x + -0.2x2 = 0.0 + 1.2x + -1.2x + 0.2x2 + -0.2x2
2.2 + -1.2x + -0.2x2 = 1.2x + -1.2x + 0.2x2 + -0.2x2

Combine like terms: 1.2x + -1.2x = 0.0
2.2 + -1.2x + -0.2x2 = 0.0 + 0.2x2 + -0.2x2
2.2 + -1.2x + -0.2x2 = 0.2x2 + -0.2x2

Combine like terms: 0.2x2 + -0.2x2 = 0.0
2.2 + -1.2x + -0.2x2 = 0.0

Begin completing the square.  Divide all terms by
-0.2 the coefficient of the squared term: 

Divide each side by '-0.2'.
-11 + 6x + x2 = 0

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + 6x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + 6x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + 6x + x2 = 0 + 11
6x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
6x + x2 = 11

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 11 + 9

Reorder the terms:
9 + 6x + x2 = 11 + 9

Combine like terms: 11 + 9 = 20
9 + 6x + x2 = 20

Factor a perfect square on the left side:
(x + 3)(x + 3) = 20

Calculate the square root of the right side: 4.472135955

Break this problem into two subproblems by setting 
(x + 3) equal to 4.472135955 and -4.472135955.

Subproblem 1

x + 3 = 4.472135955 Simplifying x + 3 = 4.472135955 Reorder the terms: 3 + x = 4.472135955 Solving 3 + x = 4.472135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 4.472135955 + -3 Combine like terms: 3 + -3 = 0 0 + x = 4.472135955 + -3 x = 4.472135955 + -3 Combine like terms: 4.472135955 + -3 = 1.472135955 x = 1.472135955 Simplifying x = 1.472135955

Subproblem 2

x + 3 = -4.472135955 Simplifying x + 3 = -4.472135955 Reorder the terms: 3 + x = -4.472135955 Solving 3 + x = -4.472135955 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -4.472135955 + -3 Combine like terms: 3 + -3 = 0 0 + x = -4.472135955 + -3 x = -4.472135955 + -3 Combine like terms: -4.472135955 + -3 = -7.472135955 x = -7.472135955 Simplifying x = -7.472135955

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.472135955, -7.472135955}

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