x+15=x^2-15x

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


Simplifying
x + 15 = x2 + -15x

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

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

Solving
15 + x = -15x + x2

Solving for variable 'x'.

Combine like terms: x + 15x = 16x
15 + 16x + -1x2 = -15x + x2 + 15x + -1x2

Reorder the terms:
15 + 16x + -1x2 = -15x + 15x + x2 + -1x2

Combine like terms: -15x + 15x = 0
15 + 16x + -1x2 = 0 + x2 + -1x2
15 + 16x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
15 + 16x + -1x2 = 0

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

Divide each side by '-1'.
-15 + -16x + x2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -16x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + -16x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -16x + x2 = 0 + 15
-16x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
-16x + x2 = 15

The x term is -16x.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x + 64 + x2 = 15 + 64

Reorder the terms:
64 + -16x + x2 = 15 + 64

Combine like terms: 15 + 64 = 79
64 + -16x + x2 = 79

Factor a perfect square on the left side:
(x + -8)(x + -8) = 79

Calculate the square root of the right side: 8.888194417

Break this problem into two subproblems by setting 
(x + -8) equal to 8.888194417 and -8.888194417.

Subproblem 1

x + -8 = 8.888194417 Simplifying x + -8 = 8.888194417 Reorder the terms: -8 + x = 8.888194417 Solving -8 + x = 8.888194417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = 8.888194417 + 8 Combine like terms: -8 + 8 = 0 0 + x = 8.888194417 + 8 x = 8.888194417 + 8 Combine like terms: 8.888194417 + 8 = 16.888194417 x = 16.888194417 Simplifying x = 16.888194417

Subproblem 2

x + -8 = -8.888194417 Simplifying x + -8 = -8.888194417 Reorder the terms: -8 + x = -8.888194417 Solving -8 + x = -8.888194417 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = -8.888194417 + 8 Combine like terms: -8 + 8 = 0 0 + x = -8.888194417 + 8 x = -8.888194417 + 8 Combine like terms: -8.888194417 + 8 = -0.888194417 x = -0.888194417 Simplifying x = -0.888194417

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.888194417, -0.888194417}

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