5y^2-y-0.5=0

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Solution for 5y^2-y-0.5=0 equation:


Simplifying
5y2 + -1y + -0.5 = 0

Reorder the terms:
-0.5 + -1y + 5y2 = 0

Solving
-0.5 + -1y + 5y2 = 0

Solving for variable 'y'.

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

Divide each side by '5'.
-0.1 + -0.2y + y2 = 0

Move the constant term to the right:

Add '0.1' to each side of the equation.
-0.1 + -0.2y + 0.1 + y2 = 0 + 0.1

Reorder the terms:
-0.1 + 0.1 + -0.2y + y2 = 0 + 0.1

Combine like terms: -0.1 + 0.1 = 0.0
0.0 + -0.2y + y2 = 0 + 0.1
-0.2y + y2 = 0 + 0.1

Combine like terms: 0 + 0.1 = 0.1
-0.2y + y2 = 0.1

The y term is -0.2y.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2y + 0.01 + y2 = 0.1 + 0.01

Reorder the terms:
0.01 + -0.2y + y2 = 0.1 + 0.01

Combine like terms: 0.1 + 0.01 = 0.11
0.01 + -0.2y + y2 = 0.11

Factor a perfect square on the left side:
(y + -0.1)(y + -0.1) = 0.11

Calculate the square root of the right side: 0.331662479

Break this problem into two subproblems by setting 
(y + -0.1) equal to 0.331662479 and -0.331662479.

Subproblem 1

y + -0.1 = 0.331662479 Simplifying y + -0.1 = 0.331662479 Reorder the terms: -0.1 + y = 0.331662479 Solving -0.1 + y = 0.331662479 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + y = 0.331662479 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + y = 0.331662479 + 0.1 y = 0.331662479 + 0.1 Combine like terms: 0.331662479 + 0.1 = 0.431662479 y = 0.431662479 Simplifying y = 0.431662479

Subproblem 2

y + -0.1 = -0.331662479 Simplifying y + -0.1 = -0.331662479 Reorder the terms: -0.1 + y = -0.331662479 Solving -0.1 + y = -0.331662479 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + y = -0.331662479 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + y = -0.331662479 + 0.1 y = -0.331662479 + 0.1 Combine like terms: -0.331662479 + 0.1 = -0.231662479 y = -0.231662479 Simplifying y = -0.231662479

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.431662479, -0.231662479}

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