x^2-2-7x=0

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Solution for x^2-2-7x=0 equation: 


Simplifying
x2 + -2 + -7x = 0

Reorder the terms:
-2 + -7x + x2 = 0

Solving
-2 + -7x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -7x + 2 + x2 = 0 + 2

Reorder the terms:
-2 + 2 + -7x + x2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -7x + x2 = 0 + 2
-7x + x2 = 0 + 2

Combine like terms: 0 + 2 = 2
-7x + x2 = 2

The x term is -7x.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7x + 12.25 + x2 = 2 + 12.25

Reorder the terms:
12.25 + -7x + x2 = 2 + 12.25

Combine like terms: 2 + 12.25 = 14.25
12.25 + -7x + x2 = 14.25

Factor a perfect square on the left side:
(x + -3.5)(x + -3.5) = 14.25

Calculate the square root of the right side: 3.774917218

Break this problem into two subproblems by setting 
(x + -3.5) equal to 3.774917218 and -3.774917218.


Subproblem 1
x + -3.5 = 3.774917218

Simplifying
x + -3.5 = 3.774917218

Reorder the terms:
-3.5 + x = 3.774917218

Solving
-3.5 + x = 3.774917218

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '3.5' to each side of the equation.
-3.5 + 3.5 + x = 3.774917218 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + x = 3.774917218 + 3.5
x = 3.774917218 + 3.5

Combine like terms: 3.774917218 + 3.5 = 7.274917218
x = 7.274917218

Simplifying
x = 7.274917218


Subproblem 2
x + -3.5 = -3.774917218

Simplifying
x + -3.5 = -3.774917218

Reorder the terms:
-3.5 + x = -3.774917218

Solving
-3.5 + x = -3.774917218

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '3.5' to each side of the equation.
-3.5 + 3.5 + x = -3.774917218 + 3.5

Combine like terms: -3.5 + 3.5 = 0.0
0.0 + x = -3.774917218 + 3.5
x = -3.774917218 + 3.5

Combine like terms: -3.774917218 + 3.5 = -0.274917218
x = -0.274917218

Simplifying
x = -0.274917218


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {7.274917218, -0.274917218}

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