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

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


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

Reorder the terms:
(4 + s)(s + -4) = -2s

Reorder the terms:
(4 + s)(-4 + s) = -2s

Multiply (4 + s) * (-4 + s)
(4(-4 + s) + s(-4 + s)) = -2s
((-4 * 4 + s * 4) + s(-4 + s)) = -2s
((-16 + 4s) + s(-4 + s)) = -2s
(-16 + 4s + (-4 * s + s * s)) = -2s
(-16 + 4s + (-4s + s2)) = -2s

Combine like terms: 4s + -4s = 0
(-16 + 0 + s2) = -2s
(-16 + s2) = -2s

Solving
-16 + s2 = -2s

Solving for variable 's'.

Reorder the terms:
-16 + 2s + s2 = -2s + 2s

Combine like terms: -2s + 2s = 0
-16 + 2s + s2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 2s + 16 + s2 = 0 + 16

Reorder the terms:
-16 + 16 + 2s + s2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 2s + s2 = 0 + 16
2s + s2 = 0 + 16

Combine like terms: 0 + 16 = 16
2s + s2 = 16

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 = 16 + 1

Reorder the terms:
1 + 2s + s2 = 16 + 1

Combine like terms: 16 + 1 = 17
1 + 2s + s2 = 17

Factor a perfect square on the left side:
(s + 1)(s + 1) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(s + 1) equal to 4.123105626 and -4.123105626.

Subproblem 1

s + 1 = 4.123105626 Simplifying s + 1 = 4.123105626 Reorder the terms: 1 + s = 4.123105626 Solving 1 + s = 4.123105626 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 = 4.123105626 + -1 Combine like terms: 1 + -1 = 0 0 + s = 4.123105626 + -1 s = 4.123105626 + -1 Combine like terms: 4.123105626 + -1 = 3.123105626 s = 3.123105626 Simplifying s = 3.123105626

Subproblem 2

s + 1 = -4.123105626 Simplifying s + 1 = -4.123105626 Reorder the terms: 1 + s = -4.123105626 Solving 1 + s = -4.123105626 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 = -4.123105626 + -1 Combine like terms: 1 + -1 = 0 0 + s = -4.123105626 + -1 s = -4.123105626 + -1 Combine like terms: -4.123105626 + -1 = -5.123105626 s = -5.123105626 Simplifying s = -5.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. s = {3.123105626, -5.123105626}

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