(y^2-3y-5)-(-y^2-7y+4)=

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Solution for (y^2-3y-5)-(-y^2-7y+4)= equation:


Simplifying
(y2 + -3y + -5) + -1(-1y2 + -7y + 4) = 0

Reorder the terms:
(-5 + -3y + y2) + -1(-1y2 + -7y + 4) = 0

Remove parenthesis around (-5 + -3y + y2)
-5 + -3y + y2 + -1(-1y2 + -7y + 4) = 0

Reorder the terms:
-5 + -3y + y2 + -1(4 + -7y + -1y2) = 0
-5 + -3y + y2 + (4 * -1 + -7y * -1 + -1y2 * -1) = 0
-5 + -3y + y2 + (-4 + 7y + 1y2) = 0

Reorder the terms:
-5 + -4 + -3y + 7y + y2 + 1y2 = 0

Combine like terms: -5 + -4 = -9
-9 + -3y + 7y + y2 + 1y2 = 0

Combine like terms: -3y + 7y = 4y
-9 + 4y + y2 + 1y2 = 0

Combine like terms: y2 + 1y2 = 2y2
-9 + 4y + 2y2 = 0

Solving
-9 + 4y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
-4.5 + 2y + y2 = 0

Move the constant term to the right:

Add '4.5' to each side of the equation.
-4.5 + 2y + 4.5 + y2 = 0 + 4.5

Reorder the terms:
-4.5 + 4.5 + 2y + y2 = 0 + 4.5

Combine like terms: -4.5 + 4.5 = 0.0
0.0 + 2y + y2 = 0 + 4.5
2y + y2 = 0 + 4.5

Combine like terms: 0 + 4.5 = 4.5
2y + y2 = 4.5

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 4.5 + 1

Reorder the terms:
1 + 2y + y2 = 4.5 + 1

Combine like terms: 4.5 + 1 = 5.5
1 + 2y + y2 = 5.5

Factor a perfect square on the left side:
(y + 1)(y + 1) = 5.5

Calculate the square root of the right side: 2.34520788

Break this problem into two subproblems by setting 
(y + 1) equal to 2.34520788 and -2.34520788.

Subproblem 1

y + 1 = 2.34520788 Simplifying y + 1 = 2.34520788 Reorder the terms: 1 + y = 2.34520788 Solving 1 + y = 2.34520788 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 2.34520788 + -1 Combine like terms: 1 + -1 = 0 0 + y = 2.34520788 + -1 y = 2.34520788 + -1 Combine like terms: 2.34520788 + -1 = 1.34520788 y = 1.34520788 Simplifying y = 1.34520788

Subproblem 2

y + 1 = -2.34520788 Simplifying y + 1 = -2.34520788 Reorder the terms: 1 + y = -2.34520788 Solving 1 + y = -2.34520788 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -2.34520788 + -1 Combine like terms: 1 + -1 = 0 0 + y = -2.34520788 + -1 y = -2.34520788 + -1 Combine like terms: -2.34520788 + -1 = -3.34520788 y = -3.34520788 Simplifying y = -3.34520788

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.34520788, -3.34520788}

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