x(x-8)=82

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Solution for x(x-8)=82 equation:


Simplifying
x(x + -8) = 82

Reorder the terms:
x(-8 + x) = 82
(-8 * x + x * x) = 82
(-8x + x2) = 82

Solving
-8x + x2 = 82

Solving for variable 'x'.

Reorder the terms:
-82 + -8x + x2 = 82 + -82

Combine like terms: 82 + -82 = 0
-82 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '82' to each side of the equation.
-82 + -8x + 82 + x2 = 0 + 82

Reorder the terms:
-82 + 82 + -8x + x2 = 0 + 82

Combine like terms: -82 + 82 = 0
0 + -8x + x2 = 0 + 82
-8x + x2 = 0 + 82

Combine like terms: 0 + 82 = 82
-8x + x2 = 82

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 = 82 + 16

Reorder the terms:
16 + -8x + x2 = 82 + 16

Combine like terms: 82 + 16 = 98
16 + -8x + x2 = 98

Factor a perfect square on the left side:
(x + -4)(x + -4) = 98

Calculate the square root of the right side: 9.899494937

Break this problem into two subproblems by setting 
(x + -4) equal to 9.899494937 and -9.899494937.

Subproblem 1

x + -4 = 9.899494937 Simplifying x + -4 = 9.899494937 Reorder the terms: -4 + x = 9.899494937 Solving -4 + x = 9.899494937 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 = 9.899494937 + 4 Combine like terms: -4 + 4 = 0 0 + x = 9.899494937 + 4 x = 9.899494937 + 4 Combine like terms: 9.899494937 + 4 = 13.899494937 x = 13.899494937 Simplifying x = 13.899494937

Subproblem 2

x + -4 = -9.899494937 Simplifying x + -4 = -9.899494937 Reorder the terms: -4 + x = -9.899494937 Solving -4 + x = -9.899494937 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 = -9.899494937 + 4 Combine like terms: -4 + 4 = 0 0 + x = -9.899494937 + 4 x = -9.899494937 + 4 Combine like terms: -9.899494937 + 4 = -5.899494937 x = -5.899494937 Simplifying x = -5.899494937

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.899494937, -5.899494937}

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