(-6y^2-8)+(7y^2+2y-5)=

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Solution for (-6y^2-8)+(7y^2+2y-5)= equation:


Simplifying
(-6y2 + -8) + (7y2 + 2y + -5) = 0

Reorder the terms:
(-8 + -6y2) + (7y2 + 2y + -5) = 0

Remove parenthesis around (-8 + -6y2)
-8 + -6y2 + (7y2 + 2y + -5) = 0

Reorder the terms:
-8 + -6y2 + (-5 + 2y + 7y2) = 0

Remove parenthesis around (-5 + 2y + 7y2)
-8 + -6y2 + -5 + 2y + 7y2 = 0

Reorder the terms:
-8 + -5 + 2y + -6y2 + 7y2 = 0

Combine like terms: -8 + -5 = -13
-13 + 2y + -6y2 + 7y2 = 0

Combine like terms: -6y2 + 7y2 = 1y2
-13 + 2y + 1y2 = 0

Solving
-13 + 2y + 1y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '13' to each side of the equation.
-13 + 2y + 13 + y2 = 0 + 13

Reorder the terms:
-13 + 13 + 2y + y2 = 0 + 13

Combine like terms: -13 + 13 = 0
0 + 2y + y2 = 0 + 13
2y + y2 = 0 + 13

Combine like terms: 0 + 13 = 13
2y + y2 = 13

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 = 13 + 1

Reorder the terms:
1 + 2y + y2 = 13 + 1

Combine like terms: 13 + 1 = 14
1 + 2y + y2 = 14

Factor a perfect square on the left side:
(y + 1)(y + 1) = 14

Calculate the square root of the right side: 3.741657387

Break this problem into two subproblems by setting 
(y + 1) equal to 3.741657387 and -3.741657387.

Subproblem 1

y + 1 = 3.741657387 Simplifying y + 1 = 3.741657387 Reorder the terms: 1 + y = 3.741657387 Solving 1 + y = 3.741657387 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 = 3.741657387 + -1 Combine like terms: 1 + -1 = 0 0 + y = 3.741657387 + -1 y = 3.741657387 + -1 Combine like terms: 3.741657387 + -1 = 2.741657387 y = 2.741657387 Simplifying y = 2.741657387

Subproblem 2

y + 1 = -3.741657387 Simplifying y + 1 = -3.741657387 Reorder the terms: 1 + y = -3.741657387 Solving 1 + y = -3.741657387 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 = -3.741657387 + -1 Combine like terms: 1 + -1 = 0 0 + y = -3.741657387 + -1 y = -3.741657387 + -1 Combine like terms: -3.741657387 + -1 = -4.741657387 y = -4.741657387 Simplifying y = -4.741657387

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.741657387, -4.741657387}

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