2s(s-3)=4s+5

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Solution for 2s(s-3)=4s+5 equation:


Simplifying
2s(s + -3) = 4s + 5

Reorder the terms:
2s(-3 + s) = 4s + 5
(-3 * 2s + s * 2s) = 4s + 5
(-6s + 2s2) = 4s + 5

Reorder the terms:
-6s + 2s2 = 5 + 4s

Solving
-6s + 2s2 = 5 + 4s

Solving for variable 's'.

Reorder the terms:
-5 + -6s + -4s + 2s2 = 5 + 4s + -5 + -4s

Combine like terms: -6s + -4s = -10s
-5 + -10s + 2s2 = 5 + 4s + -5 + -4s

Reorder the terms:
-5 + -10s + 2s2 = 5 + -5 + 4s + -4s

Combine like terms: 5 + -5 = 0
-5 + -10s + 2s2 = 0 + 4s + -4s
-5 + -10s + 2s2 = 4s + -4s

Combine like terms: 4s + -4s = 0
-5 + -10s + 2s2 = 0

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

Divide each side by '2'.
-2.5 + -5s + s2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -5s + 2.5 + s2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -5s + s2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -5s + s2 = 0 + 2.5
-5s + s2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-5s + s2 = 2.5

The s term is -5s.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5s + 6.25 + s2 = 2.5 + 6.25

Reorder the terms:
6.25 + -5s + s2 = 2.5 + 6.25

Combine like terms: 2.5 + 6.25 = 8.75
6.25 + -5s + s2 = 8.75

Factor a perfect square on the left side:
(s + -2.5)(s + -2.5) = 8.75

Calculate the square root of the right side: 2.958039892

Break this problem into two subproblems by setting 
(s + -2.5) equal to 2.958039892 and -2.958039892.

Subproblem 1

s + -2.5 = 2.958039892 Simplifying s + -2.5 = 2.958039892 Reorder the terms: -2.5 + s = 2.958039892 Solving -2.5 + s = 2.958039892 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + s = 2.958039892 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + s = 2.958039892 + 2.5 s = 2.958039892 + 2.5 Combine like terms: 2.958039892 + 2.5 = 5.458039892 s = 5.458039892 Simplifying s = 5.458039892

Subproblem 2

s + -2.5 = -2.958039892 Simplifying s + -2.5 = -2.958039892 Reorder the terms: -2.5 + s = -2.958039892 Solving -2.5 + s = -2.958039892 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + s = -2.958039892 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + s = -2.958039892 + 2.5 s = -2.958039892 + 2.5 Combine like terms: -2.958039892 + 2.5 = -0.458039892 s = -0.458039892 Simplifying s = -0.458039892

Solution

The solution to the problem is based on the solutions from the subproblems. s = {5.458039892, -0.458039892}

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