80=0.05s^2-1.1s

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Solution for 80=0.05s^2-1.1s equation:


Simplifying
80 = 0.05s2 + -1.1s

Reorder the terms:
80 = -1.1s + 0.05s2

Solving
80 = -1.1s + 0.05s2

Solving for variable 's'.

Reorder the terms:
80 + 1.1s + -0.05s2 = -1.1s + 1.1s + 0.05s2 + -0.05s2

Combine like terms: -1.1s + 1.1s = 0.0
80 + 1.1s + -0.05s2 = 0.0 + 0.05s2 + -0.05s2
80 + 1.1s + -0.05s2 = 0.05s2 + -0.05s2

Combine like terms: 0.05s2 + -0.05s2 = 0.00
80 + 1.1s + -0.05s2 = 0.00

Begin completing the square.  Divide all terms by
-0.05 the coefficient of the squared term: 

Divide each side by '-0.05'.
-1600 + -22s + s2 = 0

Move the constant term to the right:

Add '1600' to each side of the equation.
-1600 + -22s + 1600 + s2 = 0 + 1600

Reorder the terms:
-1600 + 1600 + -22s + s2 = 0 + 1600

Combine like terms: -1600 + 1600 = 0
0 + -22s + s2 = 0 + 1600
-22s + s2 = 0 + 1600

Combine like terms: 0 + 1600 = 1600
-22s + s2 = 1600

The s term is -22s.  Take half its coefficient (-11).
Square it (121) and add it to both sides.

Add '121' to each side of the equation.
-22s + 121 + s2 = 1600 + 121

Reorder the terms:
121 + -22s + s2 = 1600 + 121

Combine like terms: 1600 + 121 = 1721
121 + -22s + s2 = 1721

Factor a perfect square on the left side:
(s + -11)(s + -11) = 1721

Calculate the square root of the right side: 41.484937025

Break this problem into two subproblems by setting 
(s + -11) equal to 41.484937025 and -41.484937025.

Subproblem 1

s + -11 = 41.484937025 Simplifying s + -11 = 41.484937025 Reorder the terms: -11 + s = 41.484937025 Solving -11 + s = 41.484937025 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + s = 41.484937025 + 11 Combine like terms: -11 + 11 = 0 0 + s = 41.484937025 + 11 s = 41.484937025 + 11 Combine like terms: 41.484937025 + 11 = 52.484937025 s = 52.484937025 Simplifying s = 52.484937025

Subproblem 2

s + -11 = -41.484937025 Simplifying s + -11 = -41.484937025 Reorder the terms: -11 + s = -41.484937025 Solving -11 + s = -41.484937025 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '11' to each side of the equation. -11 + 11 + s = -41.484937025 + 11 Combine like terms: -11 + 11 = 0 0 + s = -41.484937025 + 11 s = -41.484937025 + 11 Combine like terms: -41.484937025 + 11 = -30.484937025 s = -30.484937025 Simplifying s = -30.484937025

Solution

The solution to the problem is based on the solutions from the subproblems. s = {52.484937025, -30.484937025}

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