3s(s-2)=125

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Solution for 3s(s-2)=125 equation:


Simplifying
3s(s + -2) = 125

Reorder the terms:
3s(-2 + s) = 125
(-2 * 3s + s * 3s) = 125
(-6s + 3s2) = 125

Solving
-6s + 3s2 = 125

Solving for variable 's'.

Reorder the terms:
-125 + -6s + 3s2 = 125 + -125

Combine like terms: 125 + -125 = 0
-125 + -6s + 3s2 = 0

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

Divide each side by '3'.
-41.66666667 + -2s + s2 = 0

Move the constant term to the right:

Add '41.66666667' to each side of the equation.
-41.66666667 + -2s + 41.66666667 + s2 = 0 + 41.66666667

Reorder the terms:
-41.66666667 + 41.66666667 + -2s + s2 = 0 + 41.66666667

Combine like terms: -41.66666667 + 41.66666667 = 0.00000000
0.00000000 + -2s + s2 = 0 + 41.66666667
-2s + s2 = 0 + 41.66666667

Combine like terms: 0 + 41.66666667 = 41.66666667
-2s + s2 = 41.66666667

The s term is -2s.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2s + 1 + s2 = 41.66666667 + 1

Reorder the terms:
1 + -2s + s2 = 41.66666667 + 1

Combine like terms: 41.66666667 + 1 = 42.66666667
1 + -2s + s2 = 42.66666667

Factor a perfect square on the left side:
(s + -1)(s + -1) = 42.66666667

Calculate the square root of the right side: 6.531972648

Break this problem into two subproblems by setting 
(s + -1) equal to 6.531972648 and -6.531972648.

Subproblem 1

s + -1 = 6.531972648 Simplifying s + -1 = 6.531972648 Reorder the terms: -1 + s = 6.531972648 Solving -1 + s = 6.531972648 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + s = 6.531972648 + 1 Combine like terms: -1 + 1 = 0 0 + s = 6.531972648 + 1 s = 6.531972648 + 1 Combine like terms: 6.531972648 + 1 = 7.531972648 s = 7.531972648 Simplifying s = 7.531972648

Subproblem 2

s + -1 = -6.531972648 Simplifying s + -1 = -6.531972648 Reorder the terms: -1 + s = -6.531972648 Solving -1 + s = -6.531972648 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + s = -6.531972648 + 1 Combine like terms: -1 + 1 = 0 0 + s = -6.531972648 + 1 s = -6.531972648 + 1 Combine like terms: -6.531972648 + 1 = -5.531972648 s = -5.531972648 Simplifying s = -5.531972648

Solution

The solution to the problem is based on the solutions from the subproblems. s = {7.531972648, -5.531972648}

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