12x-x^2=12.8

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Solution for 12x-x^2=12.8 equation:


Simplifying
12x + -1x2 = 12.8

Solving
12x + -1x2 = 12.8

Solving for variable 'x'.

Reorder the terms:
-12.8 + 12x + -1x2 = 12.8 + -12.8

Combine like terms: 12.8 + -12.8 = 0.0
-12.8 + 12x + -1x2 = 0.0

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

Divide each side by '-1'.
12.8 + -12x + x2 = 0.0

Move the constant term to the right:

Add '-12.8' to each side of the equation.
12.8 + -12x + -12.8 + x2 = 0.0 + -12.8

Reorder the terms:
12.8 + -12.8 + -12x + x2 = 0.0 + -12.8

Combine like terms: 12.8 + -12.8 = 0.0
0.0 + -12x + x2 = 0.0 + -12.8
-12x + x2 = 0.0 + -12.8

Combine like terms: 0.0 + -12.8 = -12.8
-12x + x2 = -12.8

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 = -12.8 + 36

Reorder the terms:
36 + -12x + x2 = -12.8 + 36

Combine like terms: -12.8 + 36 = 23.2
36 + -12x + x2 = 23.2

Factor a perfect square on the left side:
(x + -6)(x + -6) = 23.2

Calculate the square root of the right side: 4.816637832

Break this problem into two subproblems by setting 
(x + -6) equal to 4.816637832 and -4.816637832.

Subproblem 1

x + -6 = 4.816637832 Simplifying x + -6 = 4.816637832 Reorder the terms: -6 + x = 4.816637832 Solving -6 + x = 4.816637832 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 = 4.816637832 + 6 Combine like terms: -6 + 6 = 0 0 + x = 4.816637832 + 6 x = 4.816637832 + 6 Combine like terms: 4.816637832 + 6 = 10.816637832 x = 10.816637832 Simplifying x = 10.816637832

Subproblem 2

x + -6 = -4.816637832 Simplifying x + -6 = -4.816637832 Reorder the terms: -6 + x = -4.816637832 Solving -6 + x = -4.816637832 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 = -4.816637832 + 6 Combine like terms: -6 + 6 = 0 0 + x = -4.816637832 + 6 x = -4.816637832 + 6 Combine like terms: -4.816637832 + 6 = 1.183362168 x = 1.183362168 Simplifying x = 1.183362168

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.816637832, 1.183362168}

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