X(8-X)=14

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Solution for X(8-X)=14 equation:


Simplifying
X(8 + -1X) = 14
(8 * X + -1X * X) = 14
(8X + -1X2) = 14

Solving
8X + -1X2 = 14

Solving for variable 'X'.

Reorder the terms:
-14 + 8X + -1X2 = 14 + -14

Combine like terms: 14 + -14 = 0
-14 + 8X + -1X2 = 0

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

Divide each side by '-1'.
14 + -8X + X2 = 0

Move the constant term to the right:

Add '-14' to each side of the equation.
14 + -8X + -14 + X2 = 0 + -14

Reorder the terms:
14 + -14 + -8X + X2 = 0 + -14

Combine like terms: 14 + -14 = 0
0 + -8X + X2 = 0 + -14
-8X + X2 = 0 + -14

Combine like terms: 0 + -14 = -14
-8X + X2 = -14

The X term is -8X.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8X + 16 + X2 = -14 + 16

Reorder the terms:
16 + -8X + X2 = -14 + 16

Combine like terms: -14 + 16 = 2
16 + -8X + X2 = 2

Factor a perfect square on the left side:
(X + -4)(X + -4) = 2

Calculate the square root of the right side: 1.414213562

Break this problem into two subproblems by setting 
(X + -4) equal to 1.414213562 and -1.414213562.

Subproblem 1

X + -4 = 1.414213562 Simplifying X + -4 = 1.414213562 Reorder the terms: -4 + X = 1.414213562 Solving -4 + X = 1.414213562 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + X = 1.414213562 + 4 Combine like terms: -4 + 4 = 0 0 + X = 1.414213562 + 4 X = 1.414213562 + 4 Combine like terms: 1.414213562 + 4 = 5.414213562 X = 5.414213562 Simplifying X = 5.414213562

Subproblem 2

X + -4 = -1.414213562 Simplifying X + -4 = -1.414213562 Reorder the terms: -4 + X = -1.414213562 Solving -4 + X = -1.414213562 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + X = -1.414213562 + 4 Combine like terms: -4 + 4 = 0 0 + X = -1.414213562 + 4 X = -1.414213562 + 4 Combine like terms: -1.414213562 + 4 = 2.585786438 X = 2.585786438 Simplifying X = 2.585786438

Solution

The solution to the problem is based on the solutions from the subproblems. X = {5.414213562, 2.585786438}

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