2s^2+s=2

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Solution for 2s^2+s=2 equation:


Simplifying
2s2 + s = 2

Reorder the terms:
s + 2s2 = 2

Solving
s + 2s2 = 2

Solving for variable 's'.

Reorder the terms:
-2 + s + 2s2 = 2 + -2

Combine like terms: 2 + -2 = 0
-2 + s + 2s2 = 0

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

Divide each side by '2'.
-1 + 0.5s + s2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + 0.5s + 1 + s2 = 0 + 1

Reorder the terms:
-1 + 1 + 0.5s + s2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + 0.5s + s2 = 0 + 1
0.5s + s2 = 0 + 1

Combine like terms: 0 + 1 = 1
0.5s + s2 = 1

The s term is s.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.5s + 0.25 + s2 = 1 + 0.25

Reorder the terms:
0.25 + 0.5s + s2 = 1 + 0.25

Combine like terms: 1 + 0.25 = 1.25
0.25 + 0.5s + s2 = 1.25

Factor a perfect square on the left side:
(s + 0.5)(s + 0.5) = 1.25

Calculate the square root of the right side: 1.118033989

Break this problem into two subproblems by setting 
(s + 0.5) equal to 1.118033989 and -1.118033989.

Subproblem 1

s + 0.5 = 1.118033989 Simplifying s + 0.5 = 1.118033989 Reorder the terms: 0.5 + s = 1.118033989 Solving 0.5 + s = 1.118033989 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + s = 1.118033989 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + s = 1.118033989 + -0.5 s = 1.118033989 + -0.5 Combine like terms: 1.118033989 + -0.5 = 0.618033989 s = 0.618033989 Simplifying s = 0.618033989

Subproblem 2

s + 0.5 = -1.118033989 Simplifying s + 0.5 = -1.118033989 Reorder the terms: 0.5 + s = -1.118033989 Solving 0.5 + s = -1.118033989 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + s = -1.118033989 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + s = -1.118033989 + -0.5 s = -1.118033989 + -0.5 Combine like terms: -1.118033989 + -0.5 = -1.618033989 s = -1.618033989 Simplifying s = -1.618033989

Solution

The solution to the problem is based on the solutions from the subproblems. s = {0.618033989, -1.618033989}

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