9s^2+90s-125=0

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Solution for 9s^2+90s-125=0 equation:


Simplifying
9s2 + 90s + -125 = 0

Reorder the terms:
-125 + 90s + 9s2 = 0

Solving
-125 + 90s + 9s2 = 0

Solving for variable 's'.

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

Divide each side by '9'.
-13.88888889 + 10s + s2 = 0

Move the constant term to the right:

Add '13.88888889' to each side of the equation.
-13.88888889 + 10s + 13.88888889 + s2 = 0 + 13.88888889

Reorder the terms:
-13.88888889 + 13.88888889 + 10s + s2 = 0 + 13.88888889

Combine like terms: -13.88888889 + 13.88888889 = 0.00000000
0.00000000 + 10s + s2 = 0 + 13.88888889
10s + s2 = 0 + 13.88888889

Combine like terms: 0 + 13.88888889 = 13.88888889
10s + s2 = 13.88888889

The s term is 10s.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10s + 25 + s2 = 13.88888889 + 25

Reorder the terms:
25 + 10s + s2 = 13.88888889 + 25

Combine like terms: 13.88888889 + 25 = 38.88888889
25 + 10s + s2 = 38.88888889

Factor a perfect square on the left side:
(s + 5)(s + 5) = 38.88888889

Calculate the square root of the right side: 6.236095645

Break this problem into two subproblems by setting 
(s + 5) equal to 6.236095645 and -6.236095645.

Subproblem 1

s + 5 = 6.236095645 Simplifying s + 5 = 6.236095645 Reorder the terms: 5 + s = 6.236095645 Solving 5 + s = 6.236095645 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + s = 6.236095645 + -5 Combine like terms: 5 + -5 = 0 0 + s = 6.236095645 + -5 s = 6.236095645 + -5 Combine like terms: 6.236095645 + -5 = 1.236095645 s = 1.236095645 Simplifying s = 1.236095645

Subproblem 2

s + 5 = -6.236095645 Simplifying s + 5 = -6.236095645 Reorder the terms: 5 + s = -6.236095645 Solving 5 + s = -6.236095645 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + s = -6.236095645 + -5 Combine like terms: 5 + -5 = 0 0 + s = -6.236095645 + -5 s = -6.236095645 + -5 Combine like terms: -6.236095645 + -5 = -11.236095645 s = -11.236095645 Simplifying s = -11.236095645

Solution

The solution to the problem is based on the solutions from the subproblems. s = {1.236095645, -11.236095645}

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