(5y^2+4y-4)-(6y^2-7y-8)=

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Solution for (5y^2+4y-4)-(6y^2-7y-8)= equation:


Simplifying
(5y2 + 4y + -4) + -1(6y2 + -7y + -8) = 0

Reorder the terms:
(-4 + 4y + 5y2) + -1(6y2 + -7y + -8) = 0

Remove parenthesis around (-4 + 4y + 5y2)
-4 + 4y + 5y2 + -1(6y2 + -7y + -8) = 0

Reorder the terms:
-4 + 4y + 5y2 + -1(-8 + -7y + 6y2) = 0
-4 + 4y + 5y2 + (-8 * -1 + -7y * -1 + 6y2 * -1) = 0
-4 + 4y + 5y2 + (8 + 7y + -6y2) = 0

Reorder the terms:
-4 + 8 + 4y + 7y + 5y2 + -6y2 = 0

Combine like terms: -4 + 8 = 4
4 + 4y + 7y + 5y2 + -6y2 = 0

Combine like terms: 4y + 7y = 11y
4 + 11y + 5y2 + -6y2 = 0

Combine like terms: 5y2 + -6y2 = -1y2
4 + 11y + -1y2 = 0

Solving
4 + 11y + -1y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-4 + -11y + y2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + -11y + 4 + y2 = 0 + 4

Reorder the terms:
-4 + 4 + -11y + y2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -11y + y2 = 0 + 4
-11y + y2 = 0 + 4

Combine like terms: 0 + 4 = 4
-11y + y2 = 4

The y term is -11y.  Take half its coefficient (-5.5).
Square it (30.25) and add it to both sides.

Add '30.25' to each side of the equation.
-11y + 30.25 + y2 = 4 + 30.25

Reorder the terms:
30.25 + -11y + y2 = 4 + 30.25

Combine like terms: 4 + 30.25 = 34.25
30.25 + -11y + y2 = 34.25

Factor a perfect square on the left side:
(y + -5.5)(y + -5.5) = 34.25

Calculate the square root of the right side: 5.852349955

Break this problem into two subproblems by setting 
(y + -5.5) equal to 5.852349955 and -5.852349955.

Subproblem 1

y + -5.5 = 5.852349955 Simplifying y + -5.5 = 5.852349955 Reorder the terms: -5.5 + y = 5.852349955 Solving -5.5 + y = 5.852349955 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + y = 5.852349955 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + y = 5.852349955 + 5.5 y = 5.852349955 + 5.5 Combine like terms: 5.852349955 + 5.5 = 11.352349955 y = 11.352349955 Simplifying y = 11.352349955

Subproblem 2

y + -5.5 = -5.852349955 Simplifying y + -5.5 = -5.852349955 Reorder the terms: -5.5 + y = -5.852349955 Solving -5.5 + y = -5.852349955 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5.5' to each side of the equation. -5.5 + 5.5 + y = -5.852349955 + 5.5 Combine like terms: -5.5 + 5.5 = 0.0 0.0 + y = -5.852349955 + 5.5 y = -5.852349955 + 5.5 Combine like terms: -5.852349955 + 5.5 = -0.352349955 y = -0.352349955 Simplifying y = -0.352349955

Solution

The solution to the problem is based on the solutions from the subproblems. y = {11.352349955, -0.352349955}

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