4y^2-8=y

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Solution for 4y^2-8=y equation:


Simplifying
4y2 + -8 = y

Reorder the terms:
-8 + 4y2 = y

Solving
-8 + 4y2 = y

Solving for variable 'y'.

Reorder the terms:
-8 + -1y + 4y2 = y + -1y

Combine like terms: y + -1y = 0
-8 + -1y + 4y2 = 0

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

Divide each side by '4'.
-2 + -0.25y + y2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -0.25y + 2 + y2 = 0 + 2

Reorder the terms:
-2 + 2 + -0.25y + y2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -0.25y + y2 = 0 + 2
-0.25y + y2 = 0 + 2

Combine like terms: 0 + 2 = 2
-0.25y + y2 = 2

The y term is -0.25y.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25y + 0.015625 + y2 = 2 + 0.015625

Reorder the terms:
0.015625 + -0.25y + y2 = 2 + 0.015625

Combine like terms: 2 + 0.015625 = 2.015625
0.015625 + -0.25y + y2 = 2.015625

Factor a perfect square on the left side:
(y + -0.125)(y + -0.125) = 2.015625

Calculate the square root of the right side: 1.419727086

Break this problem into two subproblems by setting 
(y + -0.125) equal to 1.419727086 and -1.419727086.

Subproblem 1

y + -0.125 = 1.419727086 Simplifying y + -0.125 = 1.419727086 Reorder the terms: -0.125 + y = 1.419727086 Solving -0.125 + y = 1.419727086 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + y = 1.419727086 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + y = 1.419727086 + 0.125 y = 1.419727086 + 0.125 Combine like terms: 1.419727086 + 0.125 = 1.544727086 y = 1.544727086 Simplifying y = 1.544727086

Subproblem 2

y + -0.125 = -1.419727086 Simplifying y + -0.125 = -1.419727086 Reorder the terms: -0.125 + y = -1.419727086 Solving -0.125 + y = -1.419727086 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + y = -1.419727086 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + y = -1.419727086 + 0.125 y = -1.419727086 + 0.125 Combine like terms: -1.419727086 + 0.125 = -1.294727086 y = -1.294727086 Simplifying y = -1.294727086

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.544727086, -1.294727086}

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