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

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


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

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

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

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

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

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

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

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

Solving
-1 + -10y + 4y2 = 0

Solving for variable 'y'.

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

Divide each side by '4'.
-0.25 + -2.5y + y2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -2.5y + 0.25 + y2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -2.5y + y2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -2.5y + y2 = 0 + 0.25
-2.5y + y2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-2.5y + y2 = 0.25

The y term is -2.5y.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5y + 1.5625 + y2 = 0.25 + 1.5625

Reorder the terms:
1.5625 + -2.5y + y2 = 0.25 + 1.5625

Combine like terms: 0.25 + 1.5625 = 1.8125
1.5625 + -2.5y + y2 = 1.8125

Factor a perfect square on the left side:
(y + -1.25)(y + -1.25) = 1.8125

Calculate the square root of the right side: 1.346291202

Break this problem into two subproblems by setting 
(y + -1.25) equal to 1.346291202 and -1.346291202.

Subproblem 1

y + -1.25 = 1.346291202 Simplifying y + -1.25 = 1.346291202 Reorder the terms: -1.25 + y = 1.346291202 Solving -1.25 + y = 1.346291202 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + y = 1.346291202 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + y = 1.346291202 + 1.25 y = 1.346291202 + 1.25 Combine like terms: 1.346291202 + 1.25 = 2.596291202 y = 2.596291202 Simplifying y = 2.596291202

Subproblem 2

y + -1.25 = -1.346291202 Simplifying y + -1.25 = -1.346291202 Reorder the terms: -1.25 + y = -1.346291202 Solving -1.25 + y = -1.346291202 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + y = -1.346291202 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + y = -1.346291202 + 1.25 y = -1.346291202 + 1.25 Combine like terms: -1.346291202 + 1.25 = -0.096291202 y = -0.096291202 Simplifying y = -0.096291202

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.596291202, -0.096291202}

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