x^2-8x-30=0

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Solution for x^2-8x-30=0 equation: 


Simplifying
x2 + -8x + -30 = 0

Reorder the terms:
-30 + -8x + x2 = 0

Solving
-30 + -8x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '30' to each side of the equation.
-30 + -8x + 30 + x2 = 0 + 30

Reorder the terms:
-30 + 30 + -8x + x2 = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -8x + x2 = 0 + 30
-8x + x2 = 0 + 30

Combine like terms: 0 + 30 = 30
-8x + x2 = 30

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 = 30 + 16

Reorder the terms:
16 + -8x + x2 = 30 + 16

Combine like terms: 30 + 16 = 46
16 + -8x + x2 = 46

Factor a perfect square on the left side:
(x + -4)(x + -4) = 46

Calculate the square root of the right side: 6.782329983

Break this problem into two subproblems by setting 
(x + -4) equal to 6.782329983 and -6.782329983.


Subproblem 1
x + -4 = 6.782329983

Simplifying
x + -4 = 6.782329983

Reorder the terms:
-4 + x = 6.782329983

Solving
-4 + x = 6.782329983

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 = 6.782329983 + 4

Combine like terms: -4 + 4 = 0
0 + x = 6.782329983 + 4
x = 6.782329983 + 4

Combine like terms: 6.782329983 + 4 = 10.782329983
x = 10.782329983

Simplifying
x = 10.782329983


Subproblem 2
x + -4 = -6.782329983

Simplifying
x + -4 = -6.782329983

Reorder the terms:
-4 + x = -6.782329983

Solving
-4 + x = -6.782329983

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 = -6.782329983 + 4

Combine like terms: -4 + 4 = 0
0 + x = -6.782329983 + 4
x = -6.782329983 + 4

Combine like terms: -6.782329983 + 4 = -2.782329983
x = -2.782329983

Simplifying
x = -2.782329983


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {10.782329983, -2.782329983}

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