s^2+8s=12

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Solution for s^2+8s=12 equation:


Simplifying
s2 + 8s = 12

Reorder the terms:
8s + s2 = 12

Solving
8s + s2 = 12

Solving for variable 's'.

Reorder the terms:
-12 + 8s + s2 = 12 + -12

Combine like terms: 12 + -12 = 0
-12 + 8s + s2 = 0

Begin completing the square.

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 8s + 12 + s2 = 0 + 12

Reorder the terms:
-12 + 12 + 8s + s2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 8s + s2 = 0 + 12
8s + s2 = 0 + 12

Combine like terms: 0 + 12 = 12
8s + s2 = 12

The s term is 8s.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8s + 16 + s2 = 12 + 16

Reorder the terms:
16 + 8s + s2 = 12 + 16

Combine like terms: 12 + 16 = 28
16 + 8s + s2 = 28

Factor a perfect square on the left side:
(s + 4)(s + 4) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(s + 4) equal to 5.291502622 and -5.291502622.

Subproblem 1

s + 4 = 5.291502622 Simplifying s + 4 = 5.291502622 Reorder the terms: 4 + s = 5.291502622 Solving 4 + s = 5.291502622 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + s = 5.291502622 + -4 Combine like terms: 4 + -4 = 0 0 + s = 5.291502622 + -4 s = 5.291502622 + -4 Combine like terms: 5.291502622 + -4 = 1.291502622 s = 1.291502622 Simplifying s = 1.291502622

Subproblem 2

s + 4 = -5.291502622 Simplifying s + 4 = -5.291502622 Reorder the terms: 4 + s = -5.291502622 Solving 4 + s = -5.291502622 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + s = -5.291502622 + -4 Combine like terms: 4 + -4 = 0 0 + s = -5.291502622 + -4 s = -5.291502622 + -4 Combine like terms: -5.291502622 + -4 = -9.291502622 s = -9.291502622 Simplifying s = -9.291502622

Solution

The solution to the problem is based on the solutions from the subproblems. s = {1.291502622, -9.291502622}

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