5y^2-18y-12=0

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Solution for 5y^2-18y-12=0 equation:


Simplifying
5y2 + -18y + -12 = 0

Reorder the terms:
-12 + -18y + 5y2 = 0

Solving
-12 + -18y + 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 + -3.6y + y2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + -3.6y + 2.4 + y2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + -3.6y + y2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + -3.6y + y2 = 0 + 2.4
-3.6y + y2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
-3.6y + y2 = 2.4

The y term is -3.6y.  Take half its coefficient (-1.8).
Square it (3.24) and add it to both sides.

Add '3.24' to each side of the equation.
-3.6y + 3.24 + y2 = 2.4 + 3.24

Reorder the terms:
3.24 + -3.6y + y2 = 2.4 + 3.24

Combine like terms: 2.4 + 3.24 = 5.64
3.24 + -3.6y + y2 = 5.64

Factor a perfect square on the left side:
(y + -1.8)(y + -1.8) = 5.64

Calculate the square root of the right side: 2.374868417

Break this problem into two subproblems by setting 
(y + -1.8) equal to 2.374868417 and -2.374868417.

Subproblem 1

y + -1.8 = 2.374868417 Simplifying y + -1.8 = 2.374868417 Reorder the terms: -1.8 + y = 2.374868417 Solving -1.8 + y = 2.374868417 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + y = 2.374868417 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + y = 2.374868417 + 1.8 y = 2.374868417 + 1.8 Combine like terms: 2.374868417 + 1.8 = 4.174868417 y = 4.174868417 Simplifying y = 4.174868417

Subproblem 2

y + -1.8 = -2.374868417 Simplifying y + -1.8 = -2.374868417 Reorder the terms: -1.8 + y = -2.374868417 Solving -1.8 + y = -2.374868417 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.8' to each side of the equation. -1.8 + 1.8 + y = -2.374868417 + 1.8 Combine like terms: -1.8 + 1.8 = 0.0 0.0 + y = -2.374868417 + 1.8 y = -2.374868417 + 1.8 Combine like terms: -2.374868417 + 1.8 = -0.574868417 y = -0.574868417 Simplifying y = -0.574868417

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.174868417, -0.574868417}

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