0=13x-39-x^2

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Solution for 0=13x-39-x^2 equation:


Simplifying
0 = 13x + -39 + -1x2

Reorder the terms:
0 = -39 + 13x + -1x2

Solving
0 = -39 + 13x + -1x2

Solving for variable 'x'.

Combine like terms: 0 + 39 = 39
39 + -13x + x2 = -39 + 13x + -1x2 + 39 + -13x + x2

Reorder the terms:
39 + -13x + x2 = -39 + 39 + 13x + -13x + -1x2 + x2

Combine like terms: -39 + 39 = 0
39 + -13x + x2 = 0 + 13x + -13x + -1x2 + x2
39 + -13x + x2 = 13x + -13x + -1x2 + x2

Combine like terms: 13x + -13x = 0
39 + -13x + x2 = 0 + -1x2 + x2
39 + -13x + x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
39 + -13x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-39' to each side of the equation.
39 + -13x + -39 + x2 = 0 + -39

Reorder the terms:
39 + -39 + -13x + x2 = 0 + -39

Combine like terms: 39 + -39 = 0
0 + -13x + x2 = 0 + -39
-13x + x2 = 0 + -39

Combine like terms: 0 + -39 = -39
-13x + x2 = -39

The x term is -13x.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13x + 42.25 + x2 = -39 + 42.25

Reorder the terms:
42.25 + -13x + x2 = -39 + 42.25

Combine like terms: -39 + 42.25 = 3.25
42.25 + -13x + x2 = 3.25

Factor a perfect square on the left side:
(x + -6.5)(x + -6.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(x + -6.5) equal to 1.802775638 and -1.802775638.

Subproblem 1

x + -6.5 = 1.802775638 Simplifying x + -6.5 = 1.802775638 Reorder the terms: -6.5 + x = 1.802775638 Solving -6.5 + x = 1.802775638 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = 1.802775638 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = 1.802775638 + 6.5 x = 1.802775638 + 6.5 Combine like terms: 1.802775638 + 6.5 = 8.302775638 x = 8.302775638 Simplifying x = 8.302775638

Subproblem 2

x + -6.5 = -1.802775638 Simplifying x + -6.5 = -1.802775638 Reorder the terms: -6.5 + x = -1.802775638 Solving -6.5 + x = -1.802775638 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = -1.802775638 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = -1.802775638 + 6.5 x = -1.802775638 + 6.5 Combine like terms: -1.802775638 + 6.5 = 4.697224362 x = 4.697224362 Simplifying x = 4.697224362

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.302775638, 4.697224362}

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