8s^2-5s-1=0

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Solution for 8s^2-5s-1=0 equation:


Simplifying
8s2 + -5s + -1 = 0

Reorder the terms:
-1 + -5s + 8s2 = 0

Solving
-1 + -5s + 8s2 = 0

Solving for variable 's'.

Begin completing the square.  Divide all terms by
8 the coefficient of the squared term: 

Divide each side by '8'.
-0.125 + -0.625s + s2 = 0

Move the constant term to the right:

Add '0.125' to each side of the equation.
-0.125 + -0.625s + 0.125 + s2 = 0 + 0.125

Reorder the terms:
-0.125 + 0.125 + -0.625s + s2 = 0 + 0.125

Combine like terms: -0.125 + 0.125 = 0.000
0.000 + -0.625s + s2 = 0 + 0.125
-0.625s + s2 = 0 + 0.125

Combine like terms: 0 + 0.125 = 0.125
-0.625s + s2 = 0.125

The s term is -0.625s.  Take half its coefficient (-0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
-0.625s + 0.09765625 + s2 = 0.125 + 0.09765625

Reorder the terms:
0.09765625 + -0.625s + s2 = 0.125 + 0.09765625

Combine like terms: 0.125 + 0.09765625 = 0.22265625
0.09765625 + -0.625s + s2 = 0.22265625

Factor a perfect square on the left side:
(s + -0.3125)(s + -0.3125) = 0.22265625

Calculate the square root of the right side: 0.471864652

Break this problem into two subproblems by setting 
(s + -0.3125) equal to 0.471864652 and -0.471864652.

Subproblem 1

s + -0.3125 = 0.471864652 Simplifying s + -0.3125 = 0.471864652 Reorder the terms: -0.3125 + s = 0.471864652 Solving -0.3125 + s = 0.471864652 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + s = 0.471864652 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + s = 0.471864652 + 0.3125 s = 0.471864652 + 0.3125 Combine like terms: 0.471864652 + 0.3125 = 0.784364652 s = 0.784364652 Simplifying s = 0.784364652

Subproblem 2

s + -0.3125 = -0.471864652 Simplifying s + -0.3125 = -0.471864652 Reorder the terms: -0.3125 + s = -0.471864652 Solving -0.3125 + s = -0.471864652 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + s = -0.471864652 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + s = -0.471864652 + 0.3125 s = -0.471864652 + 0.3125 Combine like terms: -0.471864652 + 0.3125 = -0.159364652 s = -0.159364652 Simplifying s = -0.159364652

Solution

The solution to the problem is based on the solutions from the subproblems. s = {0.784364652, -0.159364652}

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