6y^2-16y-9=0

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Solution for 6y^2-16y-9=0 equation:


Simplifying
6y2 + -16y + -9 = 0

Reorder the terms:
-9 + -16y + 6y2 = 0

Solving
-9 + -16y + 6y2 = 0

Solving for variable 'y'.

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

Divide each side by '6'.
-1.5 + -2.666666667y + y2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -2.666666667y + 1.5 + y2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -2.666666667y + y2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -2.666666667y + y2 = 0 + 1.5
-2.666666667y + y2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-2.666666667y + y2 = 1.5

The y term is -2.666666667y.  Take half its coefficient (-1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
-2.666666667y + 1.777777780 + y2 = 1.5 + 1.777777780

Reorder the terms:
1.777777780 + -2.666666667y + y2 = 1.5 + 1.777777780

Combine like terms: 1.5 + 1.777777780 = 3.27777778
1.777777780 + -2.666666667y + y2 = 3.27777778

Factor a perfect square on the left side:
(y + -1.333333334)(y + -1.333333334) = 3.27777778

Calculate the square root of the right side: 1.810463416

Break this problem into two subproblems by setting 
(y + -1.333333334) equal to 1.810463416 and -1.810463416.

Subproblem 1

y + -1.333333334 = 1.810463416 Simplifying y + -1.333333334 = 1.810463416 Reorder the terms: -1.333333334 + y = 1.810463416 Solving -1.333333334 + y = 1.810463416 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + y = 1.810463416 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + y = 1.810463416 + 1.333333334 y = 1.810463416 + 1.333333334 Combine like terms: 1.810463416 + 1.333333334 = 3.14379675 y = 3.14379675 Simplifying y = 3.14379675

Subproblem 2

y + -1.333333334 = -1.810463416 Simplifying y + -1.333333334 = -1.810463416 Reorder the terms: -1.333333334 + y = -1.810463416 Solving -1.333333334 + y = -1.810463416 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.333333334' to each side of the equation. -1.333333334 + 1.333333334 + y = -1.810463416 + 1.333333334 Combine like terms: -1.333333334 + 1.333333334 = 0.000000000 0.000000000 + y = -1.810463416 + 1.333333334 y = -1.810463416 + 1.333333334 Combine like terms: -1.810463416 + 1.333333334 = -0.477130082 y = -0.477130082 Simplifying y = -0.477130082

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.14379675, -0.477130082}

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