4s^2-5s=5

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Solution for 4s^2-5s=5 equation:


Simplifying
4s2 + -5s = 5

Reorder the terms:
-5s + 4s2 = 5

Solving
-5s + 4s2 = 5

Solving for variable 's'.

Reorder the terms:
-5 + -5s + 4s2 = 5 + -5

Combine like terms: 5 + -5 = 0
-5 + -5s + 4s2 = 0

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

Divide each side by '4'.
-1.25 + -1.25s + s2 = 0

Move the constant term to the right:

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

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

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + -1.25s + s2 = 0 + 1.25
-1.25s + s2 = 0 + 1.25

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

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 = 1.25 + 0.390625

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

Combine like terms: 1.25 + 0.390625 = 1.640625
0.390625 + -1.25s + s2 = 1.640625

Factor a perfect square on the left side:
(s + -0.625)(s + -0.625) = 1.640625

Calculate the square root of the right side: 1.280868846

Break this problem into two subproblems by setting 
(s + -0.625) equal to 1.280868846 and -1.280868846.

Subproblem 1

s + -0.625 = 1.280868846 Simplifying s + -0.625 = 1.280868846 Reorder the terms: -0.625 + s = 1.280868846 Solving -0.625 + s = 1.280868846 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 = 1.280868846 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + s = 1.280868846 + 0.625 s = 1.280868846 + 0.625 Combine like terms: 1.280868846 + 0.625 = 1.905868846 s = 1.905868846 Simplifying s = 1.905868846

Subproblem 2

s + -0.625 = -1.280868846 Simplifying s + -0.625 = -1.280868846 Reorder the terms: -0.625 + s = -1.280868846 Solving -0.625 + s = -1.280868846 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 = -1.280868846 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + s = -1.280868846 + 0.625 s = -1.280868846 + 0.625 Combine like terms: -1.280868846 + 0.625 = -0.655868846 s = -0.655868846 Simplifying s = -0.655868846

Solution

The solution to the problem is based on the solutions from the subproblems. s = {1.905868846, -0.655868846}

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