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

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


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

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

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

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

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

Combine like terms: -5 + 7 = 2
2 + 7y + 3y + 4y2 + -5y2 = 0

Combine like terms: 7y + 3y = 10y
2 + 10y + 4y2 + -5y2 = 0

Combine like terms: 4y2 + -5y2 = -1y2
2 + 10y + -1y2 = 0

Solving
2 + 10y + -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'.
-2 + -10y + y2 = 0

Move the constant term to the right:

Add '2' to each side of the equation.
-2 + -10y + 2 + y2 = 0 + 2

Reorder the terms:
-2 + 2 + -10y + y2 = 0 + 2

Combine like terms: -2 + 2 = 0
0 + -10y + y2 = 0 + 2
-10y + y2 = 0 + 2

Combine like terms: 0 + 2 = 2
-10y + y2 = 2

The y term is -10y.  Take half its coefficient (-5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
-10y + 25 + y2 = 2 + 25

Reorder the terms:
25 + -10y + y2 = 2 + 25

Combine like terms: 2 + 25 = 27
25 + -10y + y2 = 27

Factor a perfect square on the left side:
(y + -5)(y + -5) = 27

Calculate the square root of the right side: 5.196152423

Break this problem into two subproblems by setting 
(y + -5) equal to 5.196152423 and -5.196152423.

Subproblem 1

y + -5 = 5.196152423 Simplifying y + -5 = 5.196152423 Reorder the terms: -5 + y = 5.196152423 Solving -5 + y = 5.196152423 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + y = 5.196152423 + 5 Combine like terms: -5 + 5 = 0 0 + y = 5.196152423 + 5 y = 5.196152423 + 5 Combine like terms: 5.196152423 + 5 = 10.196152423 y = 10.196152423 Simplifying y = 10.196152423

Subproblem 2

y + -5 = -5.196152423 Simplifying y + -5 = -5.196152423 Reorder the terms: -5 + y = -5.196152423 Solving -5 + y = -5.196152423 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '5' to each side of the equation. -5 + 5 + y = -5.196152423 + 5 Combine like terms: -5 + 5 = 0 0 + y = -5.196152423 + 5 y = -5.196152423 + 5 Combine like terms: -5.196152423 + 5 = -0.196152423 y = -0.196152423 Simplifying y = -0.196152423

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.196152423, -0.196152423}

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