s^2-4s-2=0

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Solution for s^2-4s-2=0 equation:


Simplifying
s2 + -4s + -2 = 0

Reorder the terms:
-2 + -4s + s2 = 0

Solving
-2 + -4s + s2 = 0

Solving for variable 's'.

Begin completing the square.

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -4s + 2 + s2 = 0 + 2

Reorder the terms:
-2 + 2 + -4s + s2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -4s + s2 = 0 + 2
-4s + s2 = 0 + 2

Combine like terms: 0 + 2 = 2
-4s + s2 = 2

The s term is -4s.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4s + 4 + s2 = 2 + 4

Reorder the terms:
4 + -4s + s2 = 2 + 4

Combine like terms: 2 + 4 = 6
4 + -4s + s2 = 6

Factor a perfect square on the left side:
(s + -2)(s + -2) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(s + -2) equal to 2.449489743 and -2.449489743.

Subproblem 1

s + -2 = 2.449489743 Simplifying s + -2 = 2.449489743 Reorder the terms: -2 + s = 2.449489743 Solving -2 + s = 2.449489743 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + s = 2.449489743 + 2 Combine like terms: -2 + 2 = 0 0 + s = 2.449489743 + 2 s = 2.449489743 + 2 Combine like terms: 2.449489743 + 2 = 4.449489743 s = 4.449489743 Simplifying s = 4.449489743

Subproblem 2

s + -2 = -2.449489743 Simplifying s + -2 = -2.449489743 Reorder the terms: -2 + s = -2.449489743 Solving -2 + s = -2.449489743 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + s = -2.449489743 + 2 Combine like terms: -2 + 2 = 0 0 + s = -2.449489743 + 2 s = -2.449489743 + 2 Combine like terms: -2.449489743 + 2 = -0.449489743 s = -0.449489743 Simplifying s = -0.449489743

Solution

The solution to the problem is based on the solutions from the subproblems. s = {4.449489743, -0.449489743}

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