(5y^2-6y-54)=0

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Solution for (5y^2-6y-54)=0 equation:


Simplifying
(5y2 + -6y + -54) = 0

Reorder the terms:
(-54 + -6y + 5y2) = 0

Remove parenthesis around (-54 + -6y + 5y2)
-54 + -6y + 5y2 = 0

Solving
-54 + -6y + 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'.
-10.8 + -1.2y + y2 = 0

Move the constant term to the right:

Add '10.8' to each side of the equation.
-10.8 + -1.2y + 10.8 + y2 = 0 + 10.8

Reorder the terms:
-10.8 + 10.8 + -1.2y + y2 = 0 + 10.8

Combine like terms: -10.8 + 10.8 = 0.0
0.0 + -1.2y + y2 = 0 + 10.8
-1.2y + y2 = 0 + 10.8

Combine like terms: 0 + 10.8 = 10.8
-1.2y + y2 = 10.8

The y term is -1.2y.  Take half its coefficient (-0.6).
Square it (0.36) and add it to both sides.

Add '0.36' to each side of the equation.
-1.2y + 0.36 + y2 = 10.8 + 0.36

Reorder the terms:
0.36 + -1.2y + y2 = 10.8 + 0.36

Combine like terms: 10.8 + 0.36 = 11.16
0.36 + -1.2y + y2 = 11.16

Factor a perfect square on the left side:
(y + -0.6)(y + -0.6) = 11.16

Calculate the square root of the right side: 3.340658618

Break this problem into two subproblems by setting 
(y + -0.6) equal to 3.340658618 and -3.340658618.

Subproblem 1

y + -0.6 = 3.340658618 Simplifying y + -0.6 = 3.340658618 Reorder the terms: -0.6 + y = 3.340658618 Solving -0.6 + y = 3.340658618 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + y = 3.340658618 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + y = 3.340658618 + 0.6 y = 3.340658618 + 0.6 Combine like terms: 3.340658618 + 0.6 = 3.940658618 y = 3.940658618 Simplifying y = 3.940658618

Subproblem 2

y + -0.6 = -3.340658618 Simplifying y + -0.6 = -3.340658618 Reorder the terms: -0.6 + y = -3.340658618 Solving -0.6 + y = -3.340658618 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.6' to each side of the equation. -0.6 + 0.6 + y = -3.340658618 + 0.6 Combine like terms: -0.6 + 0.6 = 0.0 0.0 + y = -3.340658618 + 0.6 y = -3.340658618 + 0.6 Combine like terms: -3.340658618 + 0.6 = -2.740658618 y = -2.740658618 Simplifying y = -2.740658618

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.940658618, -2.740658618}

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