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

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


Simplifying
(y2 + -1y + -7) + (3 + -2y + 3y2) = 0

Reorder the terms:
(-7 + -1y + y2) + (3 + -2y + 3y2) = 0

Remove parenthesis around (-7 + -1y + y2)
-7 + -1y + y2 + (3 + -2y + 3y2) = 0

Remove parenthesis around (3 + -2y + 3y2)
-7 + -1y + y2 + 3 + -2y + 3y2 = 0

Reorder the terms:
-7 + 3 + -1y + -2y + y2 + 3y2 = 0

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

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

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

Solving
-4 + -3y + 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'.
-1 + -0.75y + y2 = 0

Move the constant term to the right:

Add '1' to each side of the equation.
-1 + -0.75y + 1 + y2 = 0 + 1

Reorder the terms:
-1 + 1 + -0.75y + y2 = 0 + 1

Combine like terms: -1 + 1 = 0
0 + -0.75y + y2 = 0 + 1
-0.75y + y2 = 0 + 1

Combine like terms: 0 + 1 = 1
-0.75y + y2 = 1

The y term is -0.75y.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75y + 0.140625 + y2 = 1 + 0.140625

Reorder the terms:
0.140625 + -0.75y + y2 = 1 + 0.140625

Combine like terms: 1 + 0.140625 = 1.140625
0.140625 + -0.75y + y2 = 1.140625

Factor a perfect square on the left side:
(y + -0.375)(y + -0.375) = 1.140625

Calculate the square root of the right side: 1.068000468

Break this problem into two subproblems by setting 
(y + -0.375) equal to 1.068000468 and -1.068000468.

Subproblem 1

y + -0.375 = 1.068000468 Simplifying y + -0.375 = 1.068000468 Reorder the terms: -0.375 + y = 1.068000468 Solving -0.375 + y = 1.068000468 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + y = 1.068000468 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + y = 1.068000468 + 0.375 y = 1.068000468 + 0.375 Combine like terms: 1.068000468 + 0.375 = 1.443000468 y = 1.443000468 Simplifying y = 1.443000468

Subproblem 2

y + -0.375 = -1.068000468 Simplifying y + -0.375 = -1.068000468 Reorder the terms: -0.375 + y = -1.068000468 Solving -0.375 + y = -1.068000468 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + y = -1.068000468 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + y = -1.068000468 + 0.375 y = -1.068000468 + 0.375 Combine like terms: -1.068000468 + 0.375 = -0.693000468 y = -0.693000468 Simplifying y = -0.693000468

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.443000468, -0.693000468}

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