4s(s+2)-6s+15=10-s+8

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Solution for 4s(s+2)-6s+15=10-s+8 equation:


Simplifying
4s(s + 2) + -6s + 15 = 10 + -1s + 8

Reorder the terms:
4s(2 + s) + -6s + 15 = 10 + -1s + 8
(2 * 4s + s * 4s) + -6s + 15 = 10 + -1s + 8
(8s + 4s2) + -6s + 15 = 10 + -1s + 8

Reorder the terms:
15 + 8s + -6s + 4s2 = 10 + -1s + 8

Combine like terms: 8s + -6s = 2s
15 + 2s + 4s2 = 10 + -1s + 8

Reorder the terms:
15 + 2s + 4s2 = 10 + 8 + -1s

Combine like terms: 10 + 8 = 18
15 + 2s + 4s2 = 18 + -1s

Solving
15 + 2s + 4s2 = 18 + -1s

Solving for variable 's'.

Reorder the terms:
15 + -18 + 2s + s + 4s2 = 18 + -1s + -18 + s

Combine like terms: 15 + -18 = -3
-3 + 2s + s + 4s2 = 18 + -1s + -18 + s

Combine like terms: 2s + s = 3s
-3 + 3s + 4s2 = 18 + -1s + -18 + s

Reorder the terms:
-3 + 3s + 4s2 = 18 + -18 + -1s + s

Combine like terms: 18 + -18 = 0
-3 + 3s + 4s2 = 0 + -1s + s
-3 + 3s + 4s2 = -1s + s

Combine like terms: -1s + s = 0
-3 + 3s + 4s2 = 0

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-0.75 + 0.75s + s2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + 0.75s + 0.75 + s2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + 0.75s + s2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + 0.75s + s2 = 0 + 0.75
0.75s + s2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
0.75s + s2 = 0.75

The s term is 0.75s.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75s + 0.140625 + s2 = 0.75 + 0.140625

Reorder the terms:
0.140625 + 0.75s + s2 = 0.75 + 0.140625

Combine like terms: 0.75 + 0.140625 = 0.890625
0.140625 + 0.75s + s2 = 0.890625

Factor a perfect square on the left side:
(s + 0.375)(s + 0.375) = 0.890625

Calculate the square root of the right side: 0.943729304

Break this problem into two subproblems by setting 
(s + 0.375) equal to 0.943729304 and -0.943729304.

Subproblem 1

s + 0.375 = 0.943729304 Simplifying s + 0.375 = 0.943729304 Reorder the terms: 0.375 + s = 0.943729304 Solving 0.375 + s = 0.943729304 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + s = 0.943729304 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + s = 0.943729304 + -0.375 s = 0.943729304 + -0.375 Combine like terms: 0.943729304 + -0.375 = 0.568729304 s = 0.568729304 Simplifying s = 0.568729304

Subproblem 2

s + 0.375 = -0.943729304 Simplifying s + 0.375 = -0.943729304 Reorder the terms: 0.375 + s = -0.943729304 Solving 0.375 + s = -0.943729304 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + s = -0.943729304 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + s = -0.943729304 + -0.375 s = -0.943729304 + -0.375 Combine like terms: -0.943729304 + -0.375 = -1.318729304 s = -1.318729304 Simplifying s = -1.318729304

Solution

The solution to the problem is based on the solutions from the subproblems. s = {0.568729304, -1.318729304}

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