s^2+7s-8=8

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Solution for s^2+7s-8=8 equation:


Simplifying
s2 + 7s + -8 = 8

Reorder the terms:
-8 + 7s + s2 = 8

Solving
-8 + 7s + s2 = 8

Solving for variable 's'.

Reorder the terms:
-8 + -8 + 7s + s2 = 8 + -8

Combine like terms: -8 + -8 = -16
-16 + 7s + s2 = 8 + -8

Combine like terms: 8 + -8 = 0
-16 + 7s + s2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + 7s + 16 + s2 = 0 + 16

Reorder the terms:
-16 + 16 + 7s + s2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + 7s + s2 = 0 + 16
7s + s2 = 0 + 16

Combine like terms: 0 + 16 = 16
7s + s2 = 16

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 = 16 + 12.25

Reorder the terms:
12.25 + 7s + s2 = 16 + 12.25

Combine like terms: 16 + 12.25 = 28.25
12.25 + 7s + s2 = 28.25

Factor a perfect square on the left side:
(s + 3.5)(s + 3.5) = 28.25

Calculate the square root of the right side: 5.315072906

Break this problem into two subproblems by setting 
(s + 3.5) equal to 5.315072906 and -5.315072906.

Subproblem 1

s + 3.5 = 5.315072906 Simplifying s + 3.5 = 5.315072906 Reorder the terms: 3.5 + s = 5.315072906 Solving 3.5 + s = 5.315072906 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 = 5.315072906 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + s = 5.315072906 + -3.5 s = 5.315072906 + -3.5 Combine like terms: 5.315072906 + -3.5 = 1.815072906 s = 1.815072906 Simplifying s = 1.815072906

Subproblem 2

s + 3.5 = -5.315072906 Simplifying s + 3.5 = -5.315072906 Reorder the terms: 3.5 + s = -5.315072906 Solving 3.5 + s = -5.315072906 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 = -5.315072906 + -3.5 Combine like terms: 3.5 + -3.5 = 0.0 0.0 + s = -5.315072906 + -3.5 s = -5.315072906 + -3.5 Combine like terms: -5.315072906 + -3.5 = -8.815072906 s = -8.815072906 Simplifying s = -8.815072906

Solution

The solution to the problem is based on the solutions from the subproblems. s = {1.815072906, -8.815072906}

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