-6y^2-4y=-9

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Solution for -6y^2-4y=-9 equation:


Simplifying
-6y2 + -4y = -9

Reorder the terms:
-4y + -6y2 = -9

Solving
-4y + -6y2 = -9

Solving for variable 'y'.

Reorder the terms:
9 + -4y + -6y2 = -9 + 9

Combine like terms: -9 + 9 = 0
9 + -4y + -6y2 = 0

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

Divide each side by '-6'.
-1.5 + 0.6666666667y + y2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + 0.6666666667y + 1.5 + y2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + 0.6666666667y + y2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + 0.6666666667y + y2 = 0 + 1.5
0.6666666667y + y2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
0.6666666667y + y2 = 1.5

The y term is 0.6666666667y.  Take half its coefficient (0.3333333334).
Square it (0.1111111112) and add it to both sides.

Add '0.1111111112' to each side of the equation.
0.6666666667y + 0.1111111112 + y2 = 1.5 + 0.1111111112

Reorder the terms:
0.1111111112 + 0.6666666667y + y2 = 1.5 + 0.1111111112

Combine like terms: 1.5 + 0.1111111112 = 1.6111111112
0.1111111112 + 0.6666666667y + y2 = 1.6111111112

Factor a perfect square on the left side:
(y + 0.3333333334)(y + 0.3333333334) = 1.6111111112

Calculate the square root of the right side: 1.269295518

Break this problem into two subproblems by setting 
(y + 0.3333333334) equal to 1.269295518 and -1.269295518.

Subproblem 1

y + 0.3333333334 = 1.269295518 Simplifying y + 0.3333333334 = 1.269295518 Reorder the terms: 0.3333333334 + y = 1.269295518 Solving 0.3333333334 + y = 1.269295518 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + y = 1.269295518 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + y = 1.269295518 + -0.3333333334 y = 1.269295518 + -0.3333333334 Combine like terms: 1.269295518 + -0.3333333334 = 0.9359621846 y = 0.9359621846 Simplifying y = 0.9359621846

Subproblem 2

y + 0.3333333334 = -1.269295518 Simplifying y + 0.3333333334 = -1.269295518 Reorder the terms: 0.3333333334 + y = -1.269295518 Solving 0.3333333334 + y = -1.269295518 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.3333333334' to each side of the equation. 0.3333333334 + -0.3333333334 + y = -1.269295518 + -0.3333333334 Combine like terms: 0.3333333334 + -0.3333333334 = 0.0000000000 0.0000000000 + y = -1.269295518 + -0.3333333334 y = -1.269295518 + -0.3333333334 Combine like terms: -1.269295518 + -0.3333333334 = -1.6026288514 y = -1.6026288514 Simplifying y = -1.6026288514

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.9359621846, -1.6026288514}

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