25.6+4s-0.1s^2=

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Solution for 25.6+4s-0.1s^2= equation:


Simplifying
25.6 + 4s + -0.1s2 = 0

Solving
25.6 + 4s + -0.1s2 = 0

Solving for variable 's'.

Begin completing the square.  Divide all terms by
-0.1 the coefficient of the squared term: 

Divide each side by '-0.1'.
-256 + -40s + s2 = 0

Move the constant term to the right:

Add '256' to each side of the equation.
-256 + -40s + 256 + s2 = 0 + 256

Reorder the terms:
-256 + 256 + -40s + s2 = 0 + 256

Combine like terms: -256 + 256 = 0
0 + -40s + s2 = 0 + 256
-40s + s2 = 0 + 256

Combine like terms: 0 + 256 = 256
-40s + s2 = 256

The s term is -40s.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40s + 400 + s2 = 256 + 400

Reorder the terms:
400 + -40s + s2 = 256 + 400

Combine like terms: 256 + 400 = 656
400 + -40s + s2 = 656

Factor a perfect square on the left side:
(s + -20)(s + -20) = 656

Calculate the square root of the right side: 25.61249695

Break this problem into two subproblems by setting 
(s + -20) equal to 25.61249695 and -25.61249695.

Subproblem 1

s + -20 = 25.61249695 Simplifying s + -20 = 25.61249695 Reorder the terms: -20 + s = 25.61249695 Solving -20 + s = 25.61249695 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + s = 25.61249695 + 20 Combine like terms: -20 + 20 = 0 0 + s = 25.61249695 + 20 s = 25.61249695 + 20 Combine like terms: 25.61249695 + 20 = 45.61249695 s = 45.61249695 Simplifying s = 45.61249695

Subproblem 2

s + -20 = -25.61249695 Simplifying s + -20 = -25.61249695 Reorder the terms: -20 + s = -25.61249695 Solving -20 + s = -25.61249695 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + s = -25.61249695 + 20 Combine like terms: -20 + 20 = 0 0 + s = -25.61249695 + 20 s = -25.61249695 + 20 Combine like terms: -25.61249695 + 20 = -5.61249695 s = -5.61249695 Simplifying s = -5.61249695

Solution

The solution to the problem is based on the solutions from the subproblems. s = {45.61249695, -5.61249695}

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