s^2+8s-125=0

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Solution for s^2+8s-125=0 equation:


Simplifying
s2 + 8s + -125 = 0

Reorder the terms:
-125 + 8s + s2 = 0

Solving
-125 + 8s + s2 = 0

Solving for variable 's'.

Begin completing the square.

Move the constant term to the right:

Add '125' to each side of the equation.
-125 + 8s + 125 + s2 = 0 + 125

Reorder the terms:
-125 + 125 + 8s + s2 = 0 + 125

Combine like terms: -125 + 125 = 0
0 + 8s + s2 = 0 + 125
8s + s2 = 0 + 125

Combine like terms: 0 + 125 = 125
8s + s2 = 125

The s term is 8s.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8s + 16 + s2 = 125 + 16

Reorder the terms:
16 + 8s + s2 = 125 + 16

Combine like terms: 125 + 16 = 141
16 + 8s + s2 = 141

Factor a perfect square on the left side:
(s + 4)(s + 4) = 141

Calculate the square root of the right side: 11.874342087

Break this problem into two subproblems by setting 
(s + 4) equal to 11.874342087 and -11.874342087.

Subproblem 1

s + 4 = 11.874342087 Simplifying s + 4 = 11.874342087 Reorder the terms: 4 + s = 11.874342087 Solving 4 + s = 11.874342087 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + s = 11.874342087 + -4 Combine like terms: 4 + -4 = 0 0 + s = 11.874342087 + -4 s = 11.874342087 + -4 Combine like terms: 11.874342087 + -4 = 7.874342087 s = 7.874342087 Simplifying s = 7.874342087

Subproblem 2

s + 4 = -11.874342087 Simplifying s + 4 = -11.874342087 Reorder the terms: 4 + s = -11.874342087 Solving 4 + s = -11.874342087 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + s = -11.874342087 + -4 Combine like terms: 4 + -4 = 0 0 + s = -11.874342087 + -4 s = -11.874342087 + -4 Combine like terms: -11.874342087 + -4 = -15.874342087 s = -15.874342087 Simplifying s = -15.874342087

Solution

The solution to the problem is based on the solutions from the subproblems. s = {7.874342087, -15.874342087}

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