6y^2-y-1=9

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Solution for 6y^2-y-1=9 equation:


Simplifying
6y2 + -1y + -1 = 9

Reorder the terms:
-1 + -1y + 6y2 = 9

Solving
-1 + -1y + 6y2 = 9

Solving for variable 'y'.

Reorder the terms:
-1 + -9 + -1y + 6y2 = 9 + -9

Combine like terms: -1 + -9 = -10
-10 + -1y + 6y2 = 9 + -9

Combine like terms: 9 + -9 = 0
-10 + -1y + 6y2 = 0

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

Divide each side by '6'.
-1.666666667 + -0.1666666667y + y2 = 0

Move the constant term to the right:

Add '1.666666667' to each side of the equation.
-1.666666667 + -0.1666666667y + 1.666666667 + y2 = 0 + 1.666666667

Reorder the terms:
-1.666666667 + 1.666666667 + -0.1666666667y + y2 = 0 + 1.666666667

Combine like terms: -1.666666667 + 1.666666667 = 0.000000000
0.000000000 + -0.1666666667y + y2 = 0 + 1.666666667
-0.1666666667y + y2 = 0 + 1.666666667

Combine like terms: 0 + 1.666666667 = 1.666666667
-0.1666666667y + y2 = 1.666666667

The y term is -0.1666666667y.  Take half its coefficient (-0.08333333335).
Square it (0.006944444447) and add it to both sides.

Add '0.006944444447' to each side of the equation.
-0.1666666667y + 0.006944444447 + y2 = 1.666666667 + 0.006944444447

Reorder the terms:
0.006944444447 + -0.1666666667y + y2 = 1.666666667 + 0.006944444447

Combine like terms: 1.666666667 + 0.006944444447 = 1.673611111447
0.006944444447 + -0.1666666667y + y2 = 1.673611111447

Factor a perfect square on the left side:
(y + -0.08333333335)(y + -0.08333333335) = 1.673611111447

Calculate the square root of the right side: 1.293681225

Break this problem into two subproblems by setting 
(y + -0.08333333335) equal to 1.293681225 and -1.293681225.

Subproblem 1

y + -0.08333333335 = 1.293681225 Simplifying y + -0.08333333335 = 1.293681225 Reorder the terms: -0.08333333335 + y = 1.293681225 Solving -0.08333333335 + y = 1.293681225 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.08333333335' to each side of the equation. -0.08333333335 + 0.08333333335 + y = 1.293681225 + 0.08333333335 Combine like terms: -0.08333333335 + 0.08333333335 = 0.00000000000 0.00000000000 + y = 1.293681225 + 0.08333333335 y = 1.293681225 + 0.08333333335 Combine like terms: 1.293681225 + 0.08333333335 = 1.37701455835 y = 1.37701455835 Simplifying y = 1.37701455835

Subproblem 2

y + -0.08333333335 = -1.293681225 Simplifying y + -0.08333333335 = -1.293681225 Reorder the terms: -0.08333333335 + y = -1.293681225 Solving -0.08333333335 + y = -1.293681225 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.08333333335' to each side of the equation. -0.08333333335 + 0.08333333335 + y = -1.293681225 + 0.08333333335 Combine like terms: -0.08333333335 + 0.08333333335 = 0.00000000000 0.00000000000 + y = -1.293681225 + 0.08333333335 y = -1.293681225 + 0.08333333335 Combine like terms: -1.293681225 + 0.08333333335 = -1.21034789165 y = -1.21034789165 Simplifying y = -1.21034789165

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.37701455835, -1.21034789165}

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