2y^2-y-2=0

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Solution for 2y^2-y-2=0 equation:


Simplifying
2y2 + -1y + -2 = 0

Reorder the terms:
-2 + -1y + 2y2 = 0

Solving
-2 + -1y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
-1 + -0.5y + y2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.5y + 1 + y2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.5y + y2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.5y + y2 = 0 + 1
-0.5y + y2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.5y + y2 = 1

The y term is -0.5y.  Take half its coefficient (-0.25).
Square it (0.0625) and add it to both sides.

Add '0.0625' to each side of the equation.
-0.5y + 0.0625 + y2 = 1 + 0.0625

Reorder the terms:
0.0625 + -0.5y + y2 = 1 + 0.0625

Combine like terms: 1 + 0.0625 = 1.0625
0.0625 + -0.5y + y2 = 1.0625

Factor a perfect square on the left side:
(y + -0.25)(y + -0.25) = 1.0625

Calculate the square root of the right side: 1.030776406

Break this problem into two subproblems by setting 
(y + -0.25) equal to 1.030776406 and -1.030776406.

Subproblem 1

y + -0.25 = 1.030776406 Simplifying y + -0.25 = 1.030776406 Reorder the terms: -0.25 + y = 1.030776406 Solving -0.25 + y = 1.030776406 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + y = 1.030776406 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + y = 1.030776406 + 0.25 y = 1.030776406 + 0.25 Combine like terms: 1.030776406 + 0.25 = 1.280776406 y = 1.280776406 Simplifying y = 1.280776406

Subproblem 2

y + -0.25 = -1.030776406 Simplifying y + -0.25 = -1.030776406 Reorder the terms: -0.25 + y = -1.030776406 Solving -0.25 + y = -1.030776406 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.25' to each side of the equation. -0.25 + 0.25 + y = -1.030776406 + 0.25 Combine like terms: -0.25 + 0.25 = 0.00 0.00 + y = -1.030776406 + 0.25 y = -1.030776406 + 0.25 Combine like terms: -1.030776406 + 0.25 = -0.780776406 y = -0.780776406 Simplifying y = -0.780776406

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.280776406, -0.780776406}

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