5y^2-3y-12=0

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Solution for 5y^2-3y-12=0 equation:


Simplifying
5y2 + -3y + -12 = 0

Reorder the terms:
-12 + -3y + 5y2 = 0

Solving
-12 + -3y + 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'.
-2.4 + -0.6y + y2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -0.6y + 2.4 + y2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -0.6y + y2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -0.6y + y2 = 0 + 2.4
-0.6y + y2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-0.6y + y2 = 2.4

The y term is -0.6y.  Take half its coefficient (-0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
-0.6y + 0.09 + y2 = 2.4 + 0.09

Reorder the terms:
0.09 + -0.6y + y2 = 2.4 + 0.09

Combine like terms: 2.4 + 0.09 = 2.49
0.09 + -0.6y + y2 = 2.49

Factor a perfect square on the left side:
(y + -0.3)(y + -0.3) = 2.49

Calculate the square root of the right side: 1.577973384

Break this problem into two subproblems by setting 
(y + -0.3) equal to 1.577973384 and -1.577973384.

Subproblem 1

y + -0.3 = 1.577973384 Simplifying y + -0.3 = 1.577973384 Reorder the terms: -0.3 + y = 1.577973384 Solving -0.3 + y = 1.577973384 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + y = 1.577973384 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + y = 1.577973384 + 0.3 y = 1.577973384 + 0.3 Combine like terms: 1.577973384 + 0.3 = 1.877973384 y = 1.877973384 Simplifying y = 1.877973384

Subproblem 2

y + -0.3 = -1.577973384 Simplifying y + -0.3 = -1.577973384 Reorder the terms: -0.3 + y = -1.577973384 Solving -0.3 + y = -1.577973384 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.3' to each side of the equation. -0.3 + 0.3 + y = -1.577973384 + 0.3 Combine like terms: -0.3 + 0.3 = 0.0 0.0 + y = -1.577973384 + 0.3 y = -1.577973384 + 0.3 Combine like terms: -1.577973384 + 0.3 = -1.277973384 y = -1.277973384 Simplifying y = -1.277973384

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.877973384, -1.277973384}

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