x^2-8x-418=0

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Solution for x^2-8x-418=0 equation:


Simplifying
x2 + -8x + -418 = 0

Reorder the terms:
-418 + -8x + x2 = 0

Solving
-418 + -8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '418' to each side of the equation.
-418 + -8x + 418 + x2 = 0 + 418

Reorder the terms:
-418 + 418 + -8x + x2 = 0 + 418

Combine like terms: -418 + 418 = 0
0 + -8x + x2 = 0 + 418
-8x + x2 = 0 + 418

Combine like terms: 0 + 418 = 418
-8x + x2 = 418

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 = 418 + 16

Reorder the terms:
16 + -8x + x2 = 418 + 16

Combine like terms: 418 + 16 = 434
16 + -8x + x2 = 434

Factor a perfect square on the left side:
(x + -4)(x + -4) = 434

Calculate the square root of the right side: 20.832666656

Break this problem into two subproblems by setting 
(x + -4) equal to 20.832666656 and -20.832666656.

Subproblem 1

x + -4 = 20.832666656 Simplifying x + -4 = 20.832666656 Reorder the terms: -4 + x = 20.832666656 Solving -4 + x = 20.832666656 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 = 20.832666656 + 4 Combine like terms: -4 + 4 = 0 0 + x = 20.832666656 + 4 x = 20.832666656 + 4 Combine like terms: 20.832666656 + 4 = 24.832666656 x = 24.832666656 Simplifying x = 24.832666656

Subproblem 2

x + -4 = -20.832666656 Simplifying x + -4 = -20.832666656 Reorder the terms: -4 + x = -20.832666656 Solving -4 + x = -20.832666656 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 = -20.832666656 + 4 Combine like terms: -4 + 4 = 0 0 + x = -20.832666656 + 4 x = -20.832666656 + 4 Combine like terms: -20.832666656 + 4 = -16.832666656 x = -16.832666656 Simplifying x = -16.832666656

Solution

The solution to the problem is based on the solutions from the subproblems. x = {24.832666656, -16.832666656}

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