0=-.6x^2+7.2x-6.6

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Solution for 0=-.6x^2+7.2x-6.6 equation:


Simplifying
0 = -0.6x2 + 7.2x + -6.6

Reorder the terms:
0 = -6.6 + 7.2x + -0.6x2

Solving
0 = -6.6 + 7.2x + -0.6x2

Solving for variable 'x'.

Combine like terms: 0 + 6.6 = 6.6
6.6 + -7.2x + 0.6x2 = -6.6 + 7.2x + -0.6x2 + 6.6 + -7.2x + 0.6x2

Reorder the terms:
6.6 + -7.2x + 0.6x2 = -6.6 + 6.6 + 7.2x + -7.2x + -0.6x2 + 0.6x2

Combine like terms: -6.6 + 6.6 = 0.0
6.6 + -7.2x + 0.6x2 = 0.0 + 7.2x + -7.2x + -0.6x2 + 0.6x2
6.6 + -7.2x + 0.6x2 = 7.2x + -7.2x + -0.6x2 + 0.6x2

Combine like terms: 7.2x + -7.2x = 0.0
6.6 + -7.2x + 0.6x2 = 0.0 + -0.6x2 + 0.6x2
6.6 + -7.2x + 0.6x2 = -0.6x2 + 0.6x2

Combine like terms: -0.6x2 + 0.6x2 = 0.0
6.6 + -7.2x + 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'.
11 + -12x + x2 = 0

Move the constant term to the right:

Add '-11' to each side of the equation.
11 + -12x + -11 + x2 = 0 + -11

Reorder the terms:
11 + -11 + -12x + x2 = 0 + -11

Combine like terms: 11 + -11 = 0
0 + -12x + x2 = 0 + -11
-12x + x2 = 0 + -11

Combine like terms: 0 + -11 = -11
-12x + x2 = -11

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = -11 + 36

Reorder the terms:
36 + -12x + x2 = -11 + 36

Combine like terms: -11 + 36 = 25
36 + -12x + x2 = 25

Factor a perfect square on the left side:
(x + -6)(x + -6) = 25

Calculate the square root of the right side: 5

Break this problem into two subproblems by setting 
(x + -6) equal to 5 and -5.

Subproblem 1

x + -6 = 5 Simplifying x + -6 = 5 Reorder the terms: -6 + x = 5 Solving -6 + x = 5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 5 + 6 Combine like terms: -6 + 6 = 0 0 + x = 5 + 6 x = 5 + 6 Combine like terms: 5 + 6 = 11 x = 11 Simplifying x = 11

Subproblem 2

x + -6 = -5 Simplifying x + -6 = -5 Reorder the terms: -6 + x = -5 Solving -6 + x = -5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -5 + 6 Combine like terms: -6 + 6 = 0 0 + x = -5 + 6 x = -5 + 6 Combine like terms: -5 + 6 = 1 x = 1 Simplifying x = 1

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11, 1}

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