2y^2-1.25y-0.5=0

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Solution for 2y^2-1.25y-0.5=0 equation:


Simplifying
2y2 + -1.25y + -0.5 = 0

Reorder the terms:
-0.5 + -1.25y + 2y2 = 0

Solving
-0.5 + -1.25y + 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'.
-0.25 + -0.625y + y2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -0.625y + 0.25 + y2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -0.625y + y2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -0.625y + y2 = 0 + 0.25
-0.625y + y2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-0.625y + y2 = 0.25

The y term is -0.625y.  Take half its coefficient (-0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
-0.625y + 0.09765625 + y2 = 0.25 + 0.09765625

Reorder the terms:
0.09765625 + -0.625y + y2 = 0.25 + 0.09765625

Combine like terms: 0.25 + 0.09765625 = 0.34765625
0.09765625 + -0.625y + y2 = 0.34765625

Factor a perfect square on the left side:
(y + -0.3125)(y + -0.3125) = 0.34765625

Calculate the square root of the right side: 0.589623821

Break this problem into two subproblems by setting 
(y + -0.3125) equal to 0.589623821 and -0.589623821.

Subproblem 1

y + -0.3125 = 0.589623821 Simplifying y + -0.3125 = 0.589623821 Reorder the terms: -0.3125 + y = 0.589623821 Solving -0.3125 + y = 0.589623821 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + y = 0.589623821 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + y = 0.589623821 + 0.3125 y = 0.589623821 + 0.3125 Combine like terms: 0.589623821 + 0.3125 = 0.902123821 y = 0.902123821 Simplifying y = 0.902123821

Subproblem 2

y + -0.3125 = -0.589623821 Simplifying y + -0.3125 = -0.589623821 Reorder the terms: -0.3125 + y = -0.589623821 Solving -0.3125 + y = -0.589623821 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + y = -0.589623821 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + y = -0.589623821 + 0.3125 y = -0.589623821 + 0.3125 Combine like terms: -0.589623821 + 0.3125 = -0.277123821 y = -0.277123821 Simplifying y = -0.277123821

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.902123821, -0.277123821}

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