0=4y^2-12y-5

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Solution for 0=4y^2-12y-5 equation:


Simplifying
0 = 4y2 + -12y + -5

Reorder the terms:
0 = -5 + -12y + 4y2

Solving
0 = -5 + -12y + 4y2

Solving for variable 'y'.

Combine like terms: 0 + 5 = 5
5 + 12y + -4y2 = -5 + -12y + 4y2 + 5 + 12y + -4y2

Reorder the terms:
5 + 12y + -4y2 = -5 + 5 + -12y + 12y + 4y2 + -4y2

Combine like terms: -5 + 5 = 0
5 + 12y + -4y2 = 0 + -12y + 12y + 4y2 + -4y2
5 + 12y + -4y2 = -12y + 12y + 4y2 + -4y2

Combine like terms: -12y + 12y = 0
5 + 12y + -4y2 = 0 + 4y2 + -4y2
5 + 12y + -4y2 = 4y2 + -4y2

Combine like terms: 4y2 + -4y2 = 0
5 + 12y + -4y2 = 0

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

Divide each side by '-4'.
-1.25 + -3y + y2 = 0

Move the constant term to the right:

Add '1.25' to each side of the equation.
-1.25 + -3y + 1.25 + y2 = 0 + 1.25

Reorder the terms:
-1.25 + 1.25 + -3y + y2 = 0 + 1.25

Combine like terms: -1.25 + 1.25 = 0.00
0.00 + -3y + y2 = 0 + 1.25
-3y + y2 = 0 + 1.25

Combine like terms: 0 + 1.25 = 1.25
-3y + y2 = 1.25

The y term is -3y.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3y + 2.25 + y2 = 1.25 + 2.25

Reorder the terms:
2.25 + -3y + y2 = 1.25 + 2.25

Combine like terms: 1.25 + 2.25 = 3.5
2.25 + -3y + y2 = 3.5

Factor a perfect square on the left side:
(y + -1.5)(y + -1.5) = 3.5

Calculate the square root of the right side: 1.870828693

Break this problem into two subproblems by setting 
(y + -1.5) equal to 1.870828693 and -1.870828693.

Subproblem 1

y + -1.5 = 1.870828693 Simplifying y + -1.5 = 1.870828693 Reorder the terms: -1.5 + y = 1.870828693 Solving -1.5 + y = 1.870828693 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y = 1.870828693 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = 1.870828693 + 1.5 y = 1.870828693 + 1.5 Combine like terms: 1.870828693 + 1.5 = 3.370828693 y = 3.370828693 Simplifying y = 3.370828693

Subproblem 2

y + -1.5 = -1.870828693 Simplifying y + -1.5 = -1.870828693 Reorder the terms: -1.5 + y = -1.870828693 Solving -1.5 + y = -1.870828693 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + y = -1.870828693 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + y = -1.870828693 + 1.5 y = -1.870828693 + 1.5 Combine like terms: -1.870828693 + 1.5 = -0.370828693 y = -0.370828693 Simplifying y = -0.370828693

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.370828693, -0.370828693}

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