2y^2-28-7y=y^2-4

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Solution for 2y^2-28-7y=y^2-4 equation:


Simplifying
2y2 + -28 + -7y = y2 + -4

Reorder the terms:
-28 + -7y + 2y2 = y2 + -4

Reorder the terms:
-28 + -7y + 2y2 = -4 + y2

Solving
-28 + -7y + 2y2 = -4 + y2

Solving for variable 'y'.

Reorder the terms:
-28 + 4 + -7y + 2y2 + -1y2 = -4 + y2 + 4 + -1y2

Combine like terms: -28 + 4 = -24
-24 + -7y + 2y2 + -1y2 = -4 + y2 + 4 + -1y2

Combine like terms: 2y2 + -1y2 = 1y2
-24 + -7y + 1y2 = -4 + y2 + 4 + -1y2

Reorder the terms:
-24 + -7y + 1y2 = -4 + 4 + y2 + -1y2

Combine like terms: -4 + 4 = 0
-24 + -7y + 1y2 = 0 + y2 + -1y2
-24 + -7y + 1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
-24 + -7y + 1y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '24' to each side of the equation.
-24 + -7y + 24 + y2 = 0 + 24

Reorder the terms:
-24 + 24 + -7y + y2 = 0 + 24

Combine like terms: -24 + 24 = 0
0 + -7y + y2 = 0 + 24
-7y + y2 = 0 + 24

Combine like terms: 0 + 24 = 24
-7y + y2 = 24

The y term is -7y.  Take half its coefficient (-3.5).
Square it (12.25) and add it to both sides.

Add '12.25' to each side of the equation.
-7y + 12.25 + y2 = 24 + 12.25

Reorder the terms:
12.25 + -7y + y2 = 24 + 12.25

Combine like terms: 24 + 12.25 = 36.25
12.25 + -7y + y2 = 36.25

Factor a perfect square on the left side:
(y + -3.5)(y + -3.5) = 36.25

Calculate the square root of the right side: 6.020797289

Break this problem into two subproblems by setting 
(y + -3.5) equal to 6.020797289 and -6.020797289.

Subproblem 1

y + -3.5 = 6.020797289 Simplifying y + -3.5 = 6.020797289 Reorder the terms: -3.5 + y = 6.020797289 Solving -3.5 + y = 6.020797289 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + y = 6.020797289 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y = 6.020797289 + 3.5 y = 6.020797289 + 3.5 Combine like terms: 6.020797289 + 3.5 = 9.520797289 y = 9.520797289 Simplifying y = 9.520797289

Subproblem 2

y + -3.5 = -6.020797289 Simplifying y + -3.5 = -6.020797289 Reorder the terms: -3.5 + y = -6.020797289 Solving -3.5 + y = -6.020797289 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '3.5' to each side of the equation. -3.5 + 3.5 + y = -6.020797289 + 3.5 Combine like terms: -3.5 + 3.5 = 0.0 0.0 + y = -6.020797289 + 3.5 y = -6.020797289 + 3.5 Combine like terms: -6.020797289 + 3.5 = -2.520797289 y = -2.520797289 Simplifying y = -2.520797289

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.520797289, -2.520797289}

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