2y^2-3y-12=0

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Solution for 2y^2-3y-12=0 equation:


Simplifying
2y2 + -3y + -12 = 0

Reorder the terms:
-12 + -3y + 2y2 = 0

Solving
-12 + -3y + 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'.
-6 + -1.5y + y2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + -1.5y + 6 + y2 = 0 + 6

Reorder the terms:
-6 + 6 + -1.5y + y2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -1.5y + y2 = 0 + 6
-1.5y + y2 = 0 + 6

Combine like terms: 0 + 6 = 6
-1.5y + y2 = 6

The y term is -1.5y.  Take half its coefficient (-0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
-1.5y + 0.5625 + y2 = 6 + 0.5625

Reorder the terms:
0.5625 + -1.5y + y2 = 6 + 0.5625

Combine like terms: 6 + 0.5625 = 6.5625
0.5625 + -1.5y + y2 = 6.5625

Factor a perfect square on the left side:
(y + -0.75)(y + -0.75) = 6.5625

Calculate the square root of the right side: 2.561737691

Break this problem into two subproblems by setting 
(y + -0.75) equal to 2.561737691 and -2.561737691.

Subproblem 1

y + -0.75 = 2.561737691 Simplifying y + -0.75 = 2.561737691 Reorder the terms: -0.75 + y = 2.561737691 Solving -0.75 + y = 2.561737691 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + y = 2.561737691 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + y = 2.561737691 + 0.75 y = 2.561737691 + 0.75 Combine like terms: 2.561737691 + 0.75 = 3.311737691 y = 3.311737691 Simplifying y = 3.311737691

Subproblem 2

y + -0.75 = -2.561737691 Simplifying y + -0.75 = -2.561737691 Reorder the terms: -0.75 + y = -2.561737691 Solving -0.75 + y = -2.561737691 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.75' to each side of the equation. -0.75 + 0.75 + y = -2.561737691 + 0.75 Combine like terms: -0.75 + 0.75 = 0.00 0.00 + y = -2.561737691 + 0.75 y = -2.561737691 + 0.75 Combine like terms: -2.561737691 + 0.75 = -1.811737691 y = -1.811737691 Simplifying y = -1.811737691

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.311737691, -1.811737691}

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