8=x^2-6x+15

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Solution for 8=x^2-6x+15 equation:


Simplifying
8 = x2 + -6x + 15

Reorder the terms:
8 = 15 + -6x + x2

Solving
8 = 15 + -6x + x2

Solving for variable 'x'.

Combine like terms: 8 + -15 = -7
-7 + 6x + -1x2 = 15 + -6x + x2 + -15 + 6x + -1x2

Reorder the terms:
-7 + 6x + -1x2 = 15 + -15 + -6x + 6x + x2 + -1x2

Combine like terms: 15 + -15 = 0
-7 + 6x + -1x2 = 0 + -6x + 6x + x2 + -1x2
-7 + 6x + -1x2 = -6x + 6x + x2 + -1x2

Combine like terms: -6x + 6x = 0
-7 + 6x + -1x2 = 0 + x2 + -1x2
-7 + 6x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-7 + 6x + -1x2 = 0

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

Divide each side by '-1'.
7 + -6x + x2 = 0

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -6x + -7 + x2 = 0 + -7

Reorder the terms:
7 + -7 + -6x + x2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -6x + x2 = 0 + -7
-6x + x2 = 0 + -7

Combine like terms: 0 + -7 = -7
-6x + x2 = -7

The x term is -6x.  Take half its coefficient (-3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
-6x + 9 + x2 = -7 + 9

Reorder the terms:
9 + -6x + x2 = -7 + 9

Combine like terms: -7 + 9 = 2
9 + -6x + x2 = 2

Factor a perfect square on the left side:
(x + -3)(x + -3) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(x + -3) equal to 1.414213562 and -1.414213562.

Subproblem 1

x + -3 = 1.414213562 Simplifying x + -3 = 1.414213562 Reorder the terms: -3 + x = 1.414213562 Solving -3 + x = 1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = 1.414213562 + 3 Combine like terms: -3 + 3 = 0 0 + x = 1.414213562 + 3 x = 1.414213562 + 3 Combine like terms: 1.414213562 + 3 = 4.414213562 x = 4.414213562 Simplifying x = 4.414213562

Subproblem 2

x + -3 = -1.414213562 Simplifying x + -3 = -1.414213562 Reorder the terms: -3 + x = -1.414213562 Solving -3 + x = -1.414213562 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3' to each side of the equation. -3 + 3 + x = -1.414213562 + 3 Combine like terms: -3 + 3 = 0 0 + x = -1.414213562 + 3 x = -1.414213562 + 3 Combine like terms: -1.414213562 + 3 = 1.585786438 x = 1.585786438 Simplifying x = 1.585786438

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.414213562, 1.585786438}

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