x^2-8x=242

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Solution for x^2-8x=242 equation:


Simplifying
x2 + -8x = 242

Reorder the terms:
-8x + x2 = 242

Solving
-8x + x2 = 242

Solving for variable 'x'.

Reorder the terms:
-242 + -8x + x2 = 242 + -242

Combine like terms: 242 + -242 = 0
-242 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '242' to each side of the equation.
-242 + -8x + 242 + x2 = 0 + 242

Reorder the terms:
-242 + 242 + -8x + x2 = 0 + 242

Combine like terms: -242 + 242 = 0
0 + -8x + x2 = 0 + 242
-8x + x2 = 0 + 242

Combine like terms: 0 + 242 = 242
-8x + x2 = 242

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 = 242 + 16

Reorder the terms:
16 + -8x + x2 = 242 + 16

Combine like terms: 242 + 16 = 258
16 + -8x + x2 = 258

Factor a perfect square on the left side:
(x + -4)(x + -4) = 258

Calculate the square root of the right side: 16.062378404

Break this problem into two subproblems by setting 
(x + -4) equal to 16.062378404 and -16.062378404.

Subproblem 1

x + -4 = 16.062378404 Simplifying x + -4 = 16.062378404 Reorder the terms: -4 + x = 16.062378404 Solving -4 + x = 16.062378404 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 = 16.062378404 + 4 Combine like terms: -4 + 4 = 0 0 + x = 16.062378404 + 4 x = 16.062378404 + 4 Combine like terms: 16.062378404 + 4 = 20.062378404 x = 20.062378404 Simplifying x = 20.062378404

Subproblem 2

x + -4 = -16.062378404 Simplifying x + -4 = -16.062378404 Reorder the terms: -4 + x = -16.062378404 Solving -4 + x = -16.062378404 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 = -16.062378404 + 4 Combine like terms: -4 + 4 = 0 0 + x = -16.062378404 + 4 x = -16.062378404 + 4 Combine like terms: -16.062378404 + 4 = -12.062378404 x = -12.062378404 Simplifying x = -12.062378404

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20.062378404, -12.062378404}

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