-2y-y^2+6-4y^2=

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


Simplifying
-2y + -1y2 + 6 + -4y2 = 0

Reorder the terms:
6 + -2y + -1y2 + -4y2 = 0

Combine like terms: -1y2 + -4y2 = -5y2
6 + -2y + -5y2 = 0

Solving
6 + -2y + -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'.
-1.2 + 0.4y + y2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + 0.4y + 1.2 + y2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + 0.4y + y2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + 0.4y + y2 = 0 + 1.2
0.4y + y2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
0.4y + y2 = 1.2

The y term is 0.4y.  Take half its coefficient (0.2).
Square it (0.04) and add it to both sides.

Add '0.04' to each side of the equation.
0.4y + 0.04 + y2 = 1.2 + 0.04

Reorder the terms:
0.04 + 0.4y + y2 = 1.2 + 0.04

Combine like terms: 1.2 + 0.04 = 1.24
0.04 + 0.4y + y2 = 1.24

Factor a perfect square on the left side:
(y + 0.2)(y + 0.2) = 1.24

Calculate the square root of the right side: 1.113552873

Break this problem into two subproblems by setting 
(y + 0.2) equal to 1.113552873 and -1.113552873.

Subproblem 1

y + 0.2 = 1.113552873 Simplifying y + 0.2 = 1.113552873 Reorder the terms: 0.2 + y = 1.113552873 Solving 0.2 + y = 1.113552873 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + y = 1.113552873 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + y = 1.113552873 + -0.2 y = 1.113552873 + -0.2 Combine like terms: 1.113552873 + -0.2 = 0.913552873 y = 0.913552873 Simplifying y = 0.913552873

Subproblem 2

y + 0.2 = -1.113552873 Simplifying y + 0.2 = -1.113552873 Reorder the terms: 0.2 + y = -1.113552873 Solving 0.2 + y = -1.113552873 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.2' to each side of the equation. 0.2 + -0.2 + y = -1.113552873 + -0.2 Combine like terms: 0.2 + -0.2 = 0.0 0.0 + y = -1.113552873 + -0.2 y = -1.113552873 + -0.2 Combine like terms: -1.113552873 + -0.2 = -1.313552873 y = -1.313552873 Simplifying y = -1.313552873

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.913552873, -1.313552873}

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