64s^2+80s-25=0

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Solution for 64s^2+80s-25=0 equation:


Simplifying
64s2 + 80s + -25 = 0

Reorder the terms:
-25 + 80s + 64s2 = 0

Solving
-25 + 80s + 64s2 = 0

Solving for variable 's'.

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

Divide each side by '64'.
-0.390625 + 1.25s + s2 = 0

Move the constant term to the right:

Add '0.390625' to each side of the equation.
-0.390625 + 1.25s + 0.390625 + s2 = 0 + 0.390625

Reorder the terms:
-0.390625 + 0.390625 + 1.25s + s2 = 0 + 0.390625

Combine like terms: -0.390625 + 0.390625 = 0.000000
0.000000 + 1.25s + s2 = 0 + 0.390625
1.25s + s2 = 0 + 0.390625

Combine like terms: 0 + 0.390625 = 0.390625
1.25s + s2 = 0.390625

The s term is 1.25s.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25s + 0.390625 + s2 = 0.390625 + 0.390625

Reorder the terms:
0.390625 + 1.25s + s2 = 0.390625 + 0.390625

Combine like terms: 0.390625 + 0.390625 = 0.78125
0.390625 + 1.25s + s2 = 0.78125

Factor a perfect square on the left side:
(s + 0.625)(s + 0.625) = 0.78125

Calculate the square root of the right side: 0.883883476

Break this problem into two subproblems by setting 
(s + 0.625) equal to 0.883883476 and -0.883883476.

Subproblem 1

s + 0.625 = 0.883883476 Simplifying s + 0.625 = 0.883883476 Reorder the terms: 0.625 + s = 0.883883476 Solving 0.625 + s = 0.883883476 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + s = 0.883883476 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + s = 0.883883476 + -0.625 s = 0.883883476 + -0.625 Combine like terms: 0.883883476 + -0.625 = 0.258883476 s = 0.258883476 Simplifying s = 0.258883476

Subproblem 2

s + 0.625 = -0.883883476 Simplifying s + 0.625 = -0.883883476 Reorder the terms: 0.625 + s = -0.883883476 Solving 0.625 + s = -0.883883476 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + s = -0.883883476 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + s = -0.883883476 + -0.625 s = -0.883883476 + -0.625 Combine like terms: -0.883883476 + -0.625 = -1.508883476 s = -1.508883476 Simplifying s = -1.508883476

Solution

The solution to the problem is based on the solutions from the subproblems. s = {0.258883476, -1.508883476}

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