s^2+7s=1

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Solution for s^2+7s=1 equation:


Simplifying
s2 + 7s = 1

Reorder the terms:
7s + s2 = 1

Solving
7s + s2 = 1

Solving for variable 's'.

Reorder the terms:
-1 + 7s + s2 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + 7s + s2 = 0

Begin completing the square.

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 7s + 1 + s2 = 0 + 1

Reorder the terms:
-1 + 1 + 7s + s2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 7s + s2 = 0 + 1
7s + s2 = 0 + 1

Combine like terms: 0 + 1 = 1
7s + s2 = 1

The s term is 7s.  Take half its coefficient (3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
7s + 12.25 + s2 = 1 + 12.25

Reorder the terms:
12.25 + 7s + s2 = 1 + 12.25

Combine like terms: 1 + 12.25 = 13.25
12.25 + 7s + s2 = 13.25

Factor a perfect square on the left side:
(s + 3.5)(s + 3.5) = 13.25

Calculate the square root of the right side: 3.640054945

Break this problem into two subproblems by setting 
(s + 3.5) equal to 3.640054945 and -3.640054945.

Subproblem 1

s + 3.5 = 3.640054945 Simplifying s + 3.5 = 3.640054945 Reorder the terms: 3.5 + s = 3.640054945 Solving 3.5 + s = 3.640054945 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + s = 3.640054945 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + s = 3.640054945 + -3.5 s = 3.640054945 + -3.5 Combine like terms: 3.640054945 + -3.5 = 0.140054945 s = 0.140054945 Simplifying s = 0.140054945

Subproblem 2

s + 3.5 = -3.640054945 Simplifying s + 3.5 = -3.640054945 Reorder the terms: 3.5 + s = -3.640054945 Solving 3.5 + s = -3.640054945 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-3.5' to each side of the equation. 3.5 + -3.5 + s = -3.640054945 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + s = -3.640054945 + -3.5 s = -3.640054945 + -3.5 Combine like terms: -3.640054945 + -3.5 = -7.140054945 s = -7.140054945 Simplifying s = -7.140054945

Solution

The solution to the problem is based on the solutions from the subproblems. s = {0.140054945, -7.140054945}

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