(5y^2-y-7)+(6y^2-2y+4)=0

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Solution for (5y^2-y-7)+(6y^2-2y+4)=0 equation:


Simplifying
(5y2 + -1y + -7) + (6y2 + -2y + 4) = 0

Reorder the terms:
(-7 + -1y + 5y2) + (6y2 + -2y + 4) = 0

Remove parenthesis around (-7 + -1y + 5y2)
-7 + -1y + 5y2 + (6y2 + -2y + 4) = 0

Reorder the terms:
-7 + -1y + 5y2 + (4 + -2y + 6y2) = 0

Remove parenthesis around (4 + -2y + 6y2)
-7 + -1y + 5y2 + 4 + -2y + 6y2 = 0

Reorder the terms:
-7 + 4 + -1y + -2y + 5y2 + 6y2 = 0

Combine like terms: -7 + 4 = -3
-3 + -1y + -2y + 5y2 + 6y2 = 0

Combine like terms: -1y + -2y = -3y
-3 + -3y + 5y2 + 6y2 = 0

Combine like terms: 5y2 + 6y2 = 11y2
-3 + -3y + 11y2 = 0

Solving
-3 + -3y + 11y2 = 0

Solving for variable 'y'.

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

Divide each side by '11'.
-0.2727272727 + -0.2727272727y + y2 = 0

Move the constant term to the right:

Add '0.2727272727' to each side of the equation.
-0.2727272727 + -0.2727272727y + 0.2727272727 + y2 = 0 + 0.2727272727

Reorder the terms:
-0.2727272727 + 0.2727272727 + -0.2727272727y + y2 = 0 + 0.2727272727

Combine like terms: -0.2727272727 + 0.2727272727 = 0.0000000000
0.0000000000 + -0.2727272727y + y2 = 0 + 0.2727272727
-0.2727272727y + y2 = 0 + 0.2727272727

Combine like terms: 0 + 0.2727272727 = 0.2727272727
-0.2727272727y + y2 = 0.2727272727

The y term is -0.2727272727y.  Take half its coefficient (-0.1363636364).
Square it (0.01859504133) and add it to both sides.

Add '0.01859504133' to each side of the equation.
-0.2727272727y + 0.01859504133 + y2 = 0.2727272727 + 0.01859504133

Reorder the terms:
0.01859504133 + -0.2727272727y + y2 = 0.2727272727 + 0.01859504133

Combine like terms: 0.2727272727 + 0.01859504133 = 0.29132231403
0.01859504133 + -0.2727272727y + y2 = 0.29132231403

Factor a perfect square on the left side:
(y + -0.1363636364)(y + -0.1363636364) = 0.29132231403

Calculate the square root of the right side: 0.539742822

Break this problem into two subproblems by setting 
(y + -0.1363636364) equal to 0.539742822 and -0.539742822.

Subproblem 1

y + -0.1363636364 = 0.539742822 Simplifying y + -0.1363636364 = 0.539742822 Reorder the terms: -0.1363636364 + y = 0.539742822 Solving -0.1363636364 + y = 0.539742822 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1363636364' to each side of the equation. -0.1363636364 + 0.1363636364 + y = 0.539742822 + 0.1363636364 Combine like terms: -0.1363636364 + 0.1363636364 = 0.0000000000 0.0000000000 + y = 0.539742822 + 0.1363636364 y = 0.539742822 + 0.1363636364 Combine like terms: 0.539742822 + 0.1363636364 = 0.6761064584 y = 0.6761064584 Simplifying y = 0.6761064584

Subproblem 2

y + -0.1363636364 = -0.539742822 Simplifying y + -0.1363636364 = -0.539742822 Reorder the terms: -0.1363636364 + y = -0.539742822 Solving -0.1363636364 + y = -0.539742822 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.1363636364' to each side of the equation. -0.1363636364 + 0.1363636364 + y = -0.539742822 + 0.1363636364 Combine like terms: -0.1363636364 + 0.1363636364 = 0.0000000000 0.0000000000 + y = -0.539742822 + 0.1363636364 y = -0.539742822 + 0.1363636364 Combine like terms: -0.539742822 + 0.1363636364 = -0.4033791856 y = -0.4033791856 Simplifying y = -0.4033791856

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.6761064584, -0.4033791856}

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