(3y^2-4y-5)+(8y^2-2y-1)=

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Solution for (3y^2-4y-5)+(8y^2-2y-1)= equation:


Simplifying
(3y2 + -4y + -5) + (8y2 + -2y + -1) = 0

Reorder the terms:
(-5 + -4y + 3y2) + (8y2 + -2y + -1) = 0

Remove parenthesis around (-5 + -4y + 3y2)
-5 + -4y + 3y2 + (8y2 + -2y + -1) = 0

Reorder the terms:
-5 + -4y + 3y2 + (-1 + -2y + 8y2) = 0

Remove parenthesis around (-1 + -2y + 8y2)
-5 + -4y + 3y2 + -1 + -2y + 8y2 = 0

Reorder the terms:
-5 + -1 + -4y + -2y + 3y2 + 8y2 = 0

Combine like terms: -5 + -1 = -6
-6 + -4y + -2y + 3y2 + 8y2 = 0

Combine like terms: -4y + -2y = -6y
-6 + -6y + 3y2 + 8y2 = 0

Combine like terms: 3y2 + 8y2 = 11y2
-6 + -6y + 11y2 = 0

Solving
-6 + -6y + 11y2 = 0

Solving for variable 'y'.

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

Divide each side by '11'.
-0.5454545455 + -0.5454545455y + y2 = 0

Move the constant term to the right:

Add '0.5454545455' to each side of the equation.
-0.5454545455 + -0.5454545455y + 0.5454545455 + y2 = 0 + 0.5454545455

Reorder the terms:
-0.5454545455 + 0.5454545455 + -0.5454545455y + y2 = 0 + 0.5454545455

Combine like terms: -0.5454545455 + 0.5454545455 = 0.0000000000
0.0000000000 + -0.5454545455y + y2 = 0 + 0.5454545455
-0.5454545455y + y2 = 0 + 0.5454545455

Combine like terms: 0 + 0.5454545455 = 0.5454545455
-0.5454545455y + y2 = 0.5454545455

The y term is -0.5454545455y.  Take half its coefficient (-0.2727272728).
Square it (0.07438016533) and add it to both sides.

Add '0.07438016533' to each side of the equation.
-0.5454545455y + 0.07438016533 + y2 = 0.5454545455 + 0.07438016533

Reorder the terms:
0.07438016533 + -0.5454545455y + y2 = 0.5454545455 + 0.07438016533

Combine like terms: 0.5454545455 + 0.07438016533 = 0.61983471083
0.07438016533 + -0.5454545455y + y2 = 0.61983471083

Factor a perfect square on the left side:
(y + -0.2727272728)(y + -0.2727272728) = 0.61983471083

Calculate the square root of the right side: 0.787295822

Break this problem into two subproblems by setting 
(y + -0.2727272728) equal to 0.787295822 and -0.787295822.

Subproblem 1

y + -0.2727272728 = 0.787295822 Simplifying y + -0.2727272728 = 0.787295822 Reorder the terms: -0.2727272728 + y = 0.787295822 Solving -0.2727272728 + y = 0.787295822 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.2727272728' to each side of the equation. -0.2727272728 + 0.2727272728 + y = 0.787295822 + 0.2727272728 Combine like terms: -0.2727272728 + 0.2727272728 = 0.0000000000 0.0000000000 + y = 0.787295822 + 0.2727272728 y = 0.787295822 + 0.2727272728 Combine like terms: 0.787295822 + 0.2727272728 = 1.0600230948 y = 1.0600230948 Simplifying y = 1.0600230948

Subproblem 2

y + -0.2727272728 = -0.787295822 Simplifying y + -0.2727272728 = -0.787295822 Reorder the terms: -0.2727272728 + y = -0.787295822 Solving -0.2727272728 + y = -0.787295822 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.2727272728' to each side of the equation. -0.2727272728 + 0.2727272728 + y = -0.787295822 + 0.2727272728 Combine like terms: -0.2727272728 + 0.2727272728 = 0.0000000000 0.0000000000 + y = -0.787295822 + 0.2727272728 y = -0.787295822 + 0.2727272728 Combine like terms: -0.787295822 + 0.2727272728 = -0.5145685492 y = -0.5145685492 Simplifying y = -0.5145685492

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.0600230948, -0.5145685492}

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