0=x^2-6.6x+8

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Solution for 0=x^2-6.6x+8 equation:


Simplifying
0 = x2 + -6.6x + 8

Reorder the terms:
0 = 8 + -6.6x + x2

Solving
0 = 8 + -6.6x + x2

Solving for variable 'x'.

Combine like terms: 0 + -8 = -8
-8 + 6.6x + -1x2 = 8 + -6.6x + x2 + -8 + 6.6x + -1x2

Reorder the terms:
-8 + 6.6x + -1x2 = 8 + -8 + -6.6x + 6.6x + x2 + -1x2

Combine like terms: 8 + -8 = 0
-8 + 6.6x + -1x2 = 0 + -6.6x + 6.6x + x2 + -1x2
-8 + 6.6x + -1x2 = -6.6x + 6.6x + x2 + -1x2

Combine like terms: -6.6x + 6.6x = 0.0
-8 + 6.6x + -1x2 = 0.0 + x2 + -1x2
-8 + 6.6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-8 + 6.6x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
8 + -6.6x + x2 = 0

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + -6.6x + -8 + x2 = 0 + -8

Reorder the terms:
8 + -8 + -6.6x + x2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -6.6x + x2 = 0 + -8
-6.6x + x2 = 0 + -8

Combine like terms: 0 + -8 = -8
-6.6x + x2 = -8

The x term is -6.6x.  Take half its coefficient (-3.3).
Square it (10.89) and add it to both sides.

Add '10.89' to each side of the equation.
-6.6x + 10.89 + x2 = -8 + 10.89

Reorder the terms:
10.89 + -6.6x + x2 = -8 + 10.89

Combine like terms: -8 + 10.89 = 2.89
10.89 + -6.6x + x2 = 2.89

Factor a perfect square on the left side:
(x + -3.3)(x + -3.3) = 2.89

Calculate the square root of the right side: 1.7

Break this problem into two subproblems by setting 
(x + -3.3) equal to 1.7 and -1.7.

Subproblem 1

x + -3.3 = 1.7 Simplifying x + -3.3 = 1.7 Reorder the terms: -3.3 + x = 1.7 Solving -3.3 + x = 1.7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.3' to each side of the equation. -3.3 + 3.3 + x = 1.7 + 3.3 Combine like terms: -3.3 + 3.3 = 0.0 0.0 + x = 1.7 + 3.3 x = 1.7 + 3.3 Combine like terms: 1.7 + 3.3 = 5 x = 5 Simplifying x = 5

Subproblem 2

x + -3.3 = -1.7 Simplifying x + -3.3 = -1.7 Reorder the terms: -3.3 + x = -1.7 Solving -3.3 + x = -1.7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.3' to each side of the equation. -3.3 + 3.3 + x = -1.7 + 3.3 Combine like terms: -3.3 + 3.3 = 0.0 0.0 + x = -1.7 + 3.3 x = -1.7 + 3.3 Combine like terms: -1.7 + 3.3 = 1.6 x = 1.6 Simplifying x = 1.6

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5, 1.6}

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