13=55x-5x^2

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Solution for 13=55x-5x^2 equation:


Simplifying
13 = 55x + -5x2

Solving
13 = 55x + -5x2

Solving for variable 'x'.

Reorder the terms:
13 + -55x + 5x2 = 55x + -55x + -5x2 + 5x2

Combine like terms: 55x + -55x = 0
13 + -55x + 5x2 = 0 + -5x2 + 5x2
13 + -55x + 5x2 = -5x2 + 5x2

Combine like terms: -5x2 + 5x2 = 0
13 + -55x + 5x2 = 0

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

Divide each side by '5'.
2.6 + -11x + x2 = 0

Move the constant term to the right:

Add '-2.6' to each side of the equation.
2.6 + -11x + -2.6 + x2 = 0 + -2.6

Reorder the terms:
2.6 + -2.6 + -11x + x2 = 0 + -2.6

Combine like terms: 2.6 + -2.6 = 0.0
0.0 + -11x + x2 = 0 + -2.6
-11x + x2 = 0 + -2.6

Combine like terms: 0 + -2.6 = -2.6
-11x + x2 = -2.6

The x term is -11x.  Take half its coefficient (-5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
-11x + 30.25 + x2 = -2.6 + 30.25

Reorder the terms:
30.25 + -11x + x2 = -2.6 + 30.25

Combine like terms: -2.6 + 30.25 = 27.65
30.25 + -11x + x2 = 27.65

Factor a perfect square on the left side:
(x + -5.5)(x + -5.5) = 27.65

Calculate the square root of the right side: 5.25832673

Break this problem into two subproblems by setting 
(x + -5.5) equal to 5.25832673 and -5.25832673.

Subproblem 1

x + -5.5 = 5.25832673 Simplifying x + -5.5 = 5.25832673 Reorder the terms: -5.5 + x = 5.25832673 Solving -5.5 + x = 5.25832673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x = 5.25832673 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = 5.25832673 + 5.5 x = 5.25832673 + 5.5 Combine like terms: 5.25832673 + 5.5 = 10.75832673 x = 10.75832673 Simplifying x = 10.75832673

Subproblem 2

x + -5.5 = -5.25832673 Simplifying x + -5.5 = -5.25832673 Reorder the terms: -5.5 + x = -5.25832673 Solving -5.5 + x = -5.25832673 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + x = -5.25832673 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + x = -5.25832673 + 5.5 x = -5.25832673 + 5.5 Combine like terms: -5.25832673 + 5.5 = 0.24167327 x = 0.24167327 Simplifying x = 0.24167327

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.75832673, 0.24167327}

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