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

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


Simplifying
(-5y2 + 4y + -2) + (y2 + 7y + 3) = 0

Reorder the terms:
(-2 + 4y + -5y2) + (y2 + 7y + 3) = 0

Remove parenthesis around (-2 + 4y + -5y2)
-2 + 4y + -5y2 + (y2 + 7y + 3) = 0

Reorder the terms:
-2 + 4y + -5y2 + (3 + 7y + y2) = 0

Remove parenthesis around (3 + 7y + y2)
-2 + 4y + -5y2 + 3 + 7y + y2 = 0

Reorder the terms:
-2 + 3 + 4y + 7y + -5y2 + y2 = 0

Combine like terms: -2 + 3 = 1
1 + 4y + 7y + -5y2 + y2 = 0

Combine like terms: 4y + 7y = 11y
1 + 11y + -5y2 + y2 = 0

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

Solving
1 + 11y + -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 + -2.75y + y2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -2.75y + 0.25 + y2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -2.75y + y2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -2.75y + y2 = 0 + 0.25
-2.75y + y2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-2.75y + y2 = 0.25

The y term is -2.75y.  Take half its coefficient (-1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
-2.75y + 1.890625 + y2 = 0.25 + 1.890625

Reorder the terms:
1.890625 + -2.75y + y2 = 0.25 + 1.890625

Combine like terms: 0.25 + 1.890625 = 2.140625
1.890625 + -2.75y + y2 = 2.140625

Factor a perfect square on the left side:
(y + -1.375)(y + -1.375) = 2.140625

Calculate the square root of the right side: 1.463087489

Break this problem into two subproblems by setting 
(y + -1.375) equal to 1.463087489 and -1.463087489.

Subproblem 1

y + -1.375 = 1.463087489 Simplifying y + -1.375 = 1.463087489 Reorder the terms: -1.375 + y = 1.463087489 Solving -1.375 + y = 1.463087489 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + y = 1.463087489 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + y = 1.463087489 + 1.375 y = 1.463087489 + 1.375 Combine like terms: 1.463087489 + 1.375 = 2.838087489 y = 2.838087489 Simplifying y = 2.838087489

Subproblem 2

y + -1.375 = -1.463087489 Simplifying y + -1.375 = -1.463087489 Reorder the terms: -1.375 + y = -1.463087489 Solving -1.375 + y = -1.463087489 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1.375' to each side of the equation. -1.375 + 1.375 + y = -1.463087489 + 1.375 Combine like terms: -1.375 + 1.375 = 0.000 0.000 + y = -1.463087489 + 1.375 y = -1.463087489 + 1.375 Combine like terms: -1.463087489 + 1.375 = -0.088087489 y = -0.088087489 Simplifying y = -0.088087489

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.838087489, -0.088087489}

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