0=x^2-15x+38

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Solution for 0=x^2-15x+38 equation:


Simplifying
0 = x2 + -15x + 38

Reorder the terms:
0 = 38 + -15x + x2

Solving
0 = 38 + -15x + x2

Solving for variable 'x'.

Combine like terms: 0 + -38 = -38
-38 + 15x + -1x2 = 38 + -15x + x2 + -38 + 15x + -1x2

Reorder the terms:
-38 + 15x + -1x2 = 38 + -38 + -15x + 15x + x2 + -1x2

Combine like terms: 38 + -38 = 0
-38 + 15x + -1x2 = 0 + -15x + 15x + x2 + -1x2
-38 + 15x + -1x2 = -15x + 15x + x2 + -1x2

Combine like terms: -15x + 15x = 0
-38 + 15x + -1x2 = 0 + x2 + -1x2
-38 + 15x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-38 + 15x + -1x2 = 0

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

Divide each side by '-1'.
38 + -15x + x2 = 0

Move the constant term to the right:

Add '-38' to each side of the equation.
38 + -15x + -38 + x2 = 0 + -38

Reorder the terms:
38 + -38 + -15x + x2 = 0 + -38

Combine like terms: 38 + -38 = 0
0 + -15x + x2 = 0 + -38
-15x + x2 = 0 + -38

Combine like terms: 0 + -38 = -38
-15x + x2 = -38

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 = -38 + 56.25

Reorder the terms:
56.25 + -15x + x2 = -38 + 56.25

Combine like terms: -38 + 56.25 = 18.25
56.25 + -15x + x2 = 18.25

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 18.25

Calculate the square root of the right side: 4.272001873

Break this problem into two subproblems by setting 
(x + -7.5) equal to 4.272001873 and -4.272001873.

Subproblem 1

x + -7.5 = 4.272001873 Simplifying x + -7.5 = 4.272001873 Reorder the terms: -7.5 + x = 4.272001873 Solving -7.5 + x = 4.272001873 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 = 4.272001873 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 4.272001873 + 7.5 x = 4.272001873 + 7.5 Combine like terms: 4.272001873 + 7.5 = 11.772001873 x = 11.772001873 Simplifying x = 11.772001873

Subproblem 2

x + -7.5 = -4.272001873 Simplifying x + -7.5 = -4.272001873 Reorder the terms: -7.5 + x = -4.272001873 Solving -7.5 + x = -4.272001873 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 = -4.272001873 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -4.272001873 + 7.5 x = -4.272001873 + 7.5 Combine like terms: -4.272001873 + 7.5 = 3.227998127 x = 3.227998127 Simplifying x = 3.227998127

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.772001873, 3.227998127}

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