(4+s)(s)=100

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Solution for (4+s)(s)=100 equation:


Simplifying
(4 + s)(s) = 100

Reorder the terms for easier multiplication:
s(4 + s) = 100
(4 * s + s * s) = 100
(4s + s2) = 100

Solving
4s + s2 = 100

Solving for variable 's'.

Reorder the terms:
-100 + 4s + s2 = 100 + -100

Combine like terms: 100 + -100 = 0
-100 + 4s + s2 = 0

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + 4s + 100 + s2 = 0 + 100

Reorder the terms:
-100 + 100 + 4s + s2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + 4s + s2 = 0 + 100
4s + s2 = 0 + 100

Combine like terms: 0 + 100 = 100
4s + s2 = 100

The s term is 4s.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4s + 4 + s2 = 100 + 4

Reorder the terms:
4 + 4s + s2 = 100 + 4

Combine like terms: 100 + 4 = 104
4 + 4s + s2 = 104

Factor a perfect square on the left side:
(s + 2)(s + 2) = 104

Calculate the square root of the right side: 10.198039027

Break this problem into two subproblems by setting 
(s + 2) equal to 10.198039027 and -10.198039027.

Subproblem 1

s + 2 = 10.198039027 Simplifying s + 2 = 10.198039027 Reorder the terms: 2 + s = 10.198039027 Solving 2 + s = 10.198039027 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + s = 10.198039027 + -2 Combine like terms: 2 + -2 = 0 0 + s = 10.198039027 + -2 s = 10.198039027 + -2 Combine like terms: 10.198039027 + -2 = 8.198039027 s = 8.198039027 Simplifying s = 8.198039027

Subproblem 2

s + 2 = -10.198039027 Simplifying s + 2 = -10.198039027 Reorder the terms: 2 + s = -10.198039027 Solving 2 + s = -10.198039027 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + s = -10.198039027 + -2 Combine like terms: 2 + -2 = 0 0 + s = -10.198039027 + -2 s = -10.198039027 + -2 Combine like terms: -10.198039027 + -2 = -12.198039027 s = -12.198039027 Simplifying s = -12.198039027

Solution

The solution to the problem is based on the solutions from the subproblems. s = {8.198039027, -12.198039027}

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