4y^2-8y=13

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Solution for 4y^2-8y=13 equation:


Simplifying
4y2 + -8y = 13

Reorder the terms:
-8y + 4y2 = 13

Solving
-8y + 4y2 = 13

Solving for variable 'y'.

Reorder the terms:
-13 + -8y + 4y2 = 13 + -13

Combine like terms: 13 + -13 = 0
-13 + -8y + 4y2 = 0

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

Divide each side by '4'.
-3.25 + -2y + y2 = 0

Move the constant term to the right:

Add '3.25' to each side of the equation.
-3.25 + -2y + 3.25 + y2 = 0 + 3.25

Reorder the terms:
-3.25 + 3.25 + -2y + y2 = 0 + 3.25

Combine like terms: -3.25 + 3.25 = 0.00
0.00 + -2y + y2 = 0 + 3.25
-2y + y2 = 0 + 3.25

Combine like terms: 0 + 3.25 = 3.25
-2y + y2 = 3.25

The y term is -2y.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2y + 1 + y2 = 3.25 + 1

Reorder the terms:
1 + -2y + y2 = 3.25 + 1

Combine like terms: 3.25 + 1 = 4.25
1 + -2y + y2 = 4.25

Factor a perfect square on the left side:
(y + -1)(y + -1) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(y + -1) equal to 2.061552813 and -2.061552813.

Subproblem 1

y + -1 = 2.061552813 Simplifying y + -1 = 2.061552813 Reorder the terms: -1 + y = 2.061552813 Solving -1 + y = 2.061552813 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = 2.061552813 + 1 Combine like terms: -1 + 1 = 0 0 + y = 2.061552813 + 1 y = 2.061552813 + 1 Combine like terms: 2.061552813 + 1 = 3.061552813 y = 3.061552813 Simplifying y = 3.061552813

Subproblem 2

y + -1 = -2.061552813 Simplifying y + -1 = -2.061552813 Reorder the terms: -1 + y = -2.061552813 Solving -1 + y = -2.061552813 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = -2.061552813 + 1 Combine like terms: -1 + 1 = 0 0 + y = -2.061552813 + 1 y = -2.061552813 + 1 Combine like terms: -2.061552813 + 1 = -1.061552813 y = -1.061552813 Simplifying y = -1.061552813

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.061552813, -1.061552813}

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