s^2=42-2s

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Solution for s^2=42-2s equation:


Simplifying
s2 = 42 + -2s

Solving
s2 = 42 + -2s

Solving for variable 's'.

Reorder the terms:
-42 + 2s + s2 = 42 + -2s + -42 + 2s

Reorder the terms:
-42 + 2s + s2 = 42 + -42 + -2s + 2s

Combine like terms: 42 + -42 = 0
-42 + 2s + s2 = 0 + -2s + 2s
-42 + 2s + s2 = -2s + 2s

Combine like terms: -2s + 2s = 0
-42 + 2s + s2 = 0

Begin completing the square.

Move the constant term to the right:

Add '42' to each side of the equation.
-42 + 2s + 42 + s2 = 0 + 42

Reorder the terms:
-42 + 42 + 2s + s2 = 0 + 42

Combine like terms: -42 + 42 = 0
0 + 2s + s2 = 0 + 42
2s + s2 = 0 + 42

Combine like terms: 0 + 42 = 42
2s + s2 = 42

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 = 42 + 1

Reorder the terms:
1 + 2s + s2 = 42 + 1

Combine like terms: 42 + 1 = 43
1 + 2s + s2 = 43

Factor a perfect square on the left side:
(s + 1)(s + 1) = 43

Calculate the square root of the right side: 6.557438524

Break this problem into two subproblems by setting 
(s + 1) equal to 6.557438524 and -6.557438524.

Subproblem 1

s + 1 = 6.557438524 Simplifying s + 1 = 6.557438524 Reorder the terms: 1 + s = 6.557438524 Solving 1 + s = 6.557438524 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 = 6.557438524 + -1 Combine like terms: 1 + -1 = 0 0 + s = 6.557438524 + -1 s = 6.557438524 + -1 Combine like terms: 6.557438524 + -1 = 5.557438524 s = 5.557438524 Simplifying s = 5.557438524

Subproblem 2

s + 1 = -6.557438524 Simplifying s + 1 = -6.557438524 Reorder the terms: 1 + s = -6.557438524 Solving 1 + s = -6.557438524 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 = -6.557438524 + -1 Combine like terms: 1 + -1 = 0 0 + s = -6.557438524 + -1 s = -6.557438524 + -1 Combine like terms: -6.557438524 + -1 = -7.557438524 s = -7.557438524 Simplifying s = -7.557438524

Solution

The solution to the problem is based on the solutions from the subproblems. s = {5.557438524, -7.557438524}

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