11-6x=0.8x^2

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Solution for 11-6x=0.8x^2 equation:


Simplifying
11 + -6x = 0.8x2

Solving
11 + -6x = 0.8x2

Solving for variable 'x'.

Combine like terms: 0.8x2 + -0.8x2 = 0.0
11 + -6x + -0.8x2 = 0.0

Begin completing the square.  Divide all terms by
-0.8 the coefficient of the squared term: 

Divide each side by '-0.8'.
-13.75 + 7.5x + x2 = 0

Move the constant term to the right:

Add '13.75' to each side of the equation.
-13.75 + 7.5x + 13.75 + x2 = 0 + 13.75

Reorder the terms:
-13.75 + 13.75 + 7.5x + x2 = 0 + 13.75

Combine like terms: -13.75 + 13.75 = 0.00
0.00 + 7.5x + x2 = 0 + 13.75
7.5x + x2 = 0 + 13.75

Combine like terms: 0 + 13.75 = 13.75
7.5x + x2 = 13.75

The x term is 7.5x.  Take half its coefficient (3.75).
Square it (14.0625) and add it to both sides.

Add '14.0625' to each side of the equation.
7.5x + 14.0625 + x2 = 13.75 + 14.0625

Reorder the terms:
14.0625 + 7.5x + x2 = 13.75 + 14.0625

Combine like terms: 13.75 + 14.0625 = 27.8125
14.0625 + 7.5x + x2 = 27.8125

Factor a perfect square on the left side:
(x + 3.75)(x + 3.75) = 27.8125

Calculate the square root of the right side: 5.273755777

Break this problem into two subproblems by setting 
(x + 3.75) equal to 5.273755777 and -5.273755777.

Subproblem 1

x + 3.75 = 5.273755777 Simplifying x + 3.75 = 5.273755777 Reorder the terms: 3.75 + x = 5.273755777 Solving 3.75 + x = 5.273755777 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = 5.273755777 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = 5.273755777 + -3.75 x = 5.273755777 + -3.75 Combine like terms: 5.273755777 + -3.75 = 1.523755777 x = 1.523755777 Simplifying x = 1.523755777

Subproblem 2

x + 3.75 = -5.273755777 Simplifying x + 3.75 = -5.273755777 Reorder the terms: 3.75 + x = -5.273755777 Solving 3.75 + x = -5.273755777 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.75' to each side of the equation. 3.75 + -3.75 + x = -5.273755777 + -3.75 Combine like terms: 3.75 + -3.75 = 0.00 0.00 + x = -5.273755777 + -3.75 x = -5.273755777 + -3.75 Combine like terms: -5.273755777 + -3.75 = -9.023755777 x = -9.023755777 Simplifying x = -9.023755777

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.523755777, -9.023755777}

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