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

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


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

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

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

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

Combine like terms: -3y + -7y = -10y
-5 + -3y + -1y2 + -1(4 + -10y) = 0
-5 + -3y + -1y2 + (4 * -1 + -10y * -1) = 0
-5 + -3y + -1y2 + (-4 + 10y) = 0

Reorder the terms:
-5 + -4 + -3y + 10y + -1y2 = 0

Combine like terms: -5 + -4 = -9
-9 + -3y + 10y + -1y2 = 0

Combine like terms: -3y + 10y = 7y
-9 + 7y + -1y2 = 0

Solving
-9 + 7y + -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'.
9 + -7y + y2 = 0

Move the constant term to the right:

Add '-9' to each side of the equation.
9 + -7y + -9 + y2 = 0 + -9

Reorder the terms:
9 + -9 + -7y + y2 = 0 + -9

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

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

The y term is -7y.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7y + 12.25 + y2 = -9 + 12.25

Reorder the terms:
12.25 + -7y + y2 = -9 + 12.25

Combine like terms: -9 + 12.25 = 3.25
12.25 + -7y + y2 = 3.25

Factor a perfect square on the left side:
(y + -3.5)(y + -3.5) = 3.25

Calculate the square root of the right side: 1.802775638

Break this problem into two subproblems by setting 
(y + -3.5) equal to 1.802775638 and -1.802775638.

Subproblem 1

y + -3.5 = 1.802775638 Simplifying y + -3.5 = 1.802775638 Reorder the terms: -3.5 + y = 1.802775638 Solving -3.5 + y = 1.802775638 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + y = 1.802775638 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y = 1.802775638 + 3.5 y = 1.802775638 + 3.5 Combine like terms: 1.802775638 + 3.5 = 5.302775638 y = 5.302775638 Simplifying y = 5.302775638

Subproblem 2

y + -3.5 = -1.802775638 Simplifying y + -3.5 = -1.802775638 Reorder the terms: -3.5 + y = -1.802775638 Solving -3.5 + y = -1.802775638 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + y = -1.802775638 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y = -1.802775638 + 3.5 y = -1.802775638 + 3.5 Combine like terms: -1.802775638 + 3.5 = 1.697224362 y = 1.697224362 Simplifying y = 1.697224362

Solution

The solution to the problem is based on the solutions from the subproblems. y = {5.302775638, 1.697224362}

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