x=x^2-14x+39

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Solution for x=x^2-14x+39 equation:


Simplifying
x = x2 + -14x + 39

Reorder the terms:
x = 39 + -14x + x2

Solving
x = 39 + -14x + x2

Solving for variable 'x'.

Reorder the terms:
-39 + x + 14x + -1x2 = 39 + -14x + x2 + -39 + 14x + -1x2

Combine like terms: x + 14x = 15x
-39 + 15x + -1x2 = 39 + -14x + x2 + -39 + 14x + -1x2

Reorder the terms:
-39 + 15x + -1x2 = 39 + -39 + -14x + 14x + x2 + -1x2

Combine like terms: 39 + -39 = 0
-39 + 15x + -1x2 = 0 + -14x + 14x + x2 + -1x2
-39 + 15x + -1x2 = -14x + 14x + x2 + -1x2

Combine like terms: -14x + 14x = 0
-39 + 15x + -1x2 = 0 + x2 + -1x2
-39 + 15x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-39 + 15x + -1x2 = 0

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

Divide each side by '-1'.
39 + -15x + x2 = 0

Move the constant term to the right:

Add '-39' to each side of the equation.
39 + -15x + -39 + x2 = 0 + -39

Reorder the terms:
39 + -39 + -15x + x2 = 0 + -39

Combine like terms: 39 + -39 = 0
0 + -15x + x2 = 0 + -39
-15x + x2 = 0 + -39

Combine like terms: 0 + -39 = -39
-15x + x2 = -39

The x term is -15x.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15x + 56.25 + x2 = -39 + 56.25

Reorder the terms:
56.25 + -15x + x2 = -39 + 56.25

Combine like terms: -39 + 56.25 = 17.25
56.25 + -15x + x2 = 17.25

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 17.25

Calculate the square root of the right side: 4.153311931

Break this problem into two subproblems by setting 
(x + -7.5) equal to 4.153311931 and -4.153311931.

Subproblem 1

x + -7.5 = 4.153311931 Simplifying x + -7.5 = 4.153311931 Reorder the terms: -7.5 + x = 4.153311931 Solving -7.5 + x = 4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = 4.153311931 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 4.153311931 + 7.5 x = 4.153311931 + 7.5 Combine like terms: 4.153311931 + 7.5 = 11.653311931 x = 11.653311931 Simplifying x = 11.653311931

Subproblem 2

x + -7.5 = -4.153311931 Simplifying x + -7.5 = -4.153311931 Reorder the terms: -7.5 + x = -4.153311931 Solving -7.5 + x = -4.153311931 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = -4.153311931 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -4.153311931 + 7.5 x = -4.153311931 + 7.5 Combine like terms: -4.153311931 + 7.5 = 3.346688069 x = 3.346688069 Simplifying x = 3.346688069

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.653311931, 3.346688069}

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