2y^2-8y+15-2y+12y-36=0

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Solution for 2y^2-8y+15-2y+12y-36=0 equation:


Simplifying
2y2 + -8y + 15 + -2y + 12y + -36 = 0

Reorder the terms:
15 + -36 + -8y + -2y + 12y + 2y2 = 0

Combine like terms: 15 + -36 = -21
-21 + -8y + -2y + 12y + 2y2 = 0

Combine like terms: -8y + -2y = -10y
-21 + -10y + 12y + 2y2 = 0

Combine like terms: -10y + 12y = 2y
-21 + 2y + 2y2 = 0

Solving
-21 + 2y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
-10.5 + y + y2 = 0

Move the constant term to the right:

Add '10.5' to each side of the equation.
-10.5 + y + 10.5 + y2 = 0 + 10.5

Reorder the terms:
-10.5 + 10.5 + y + y2 = 0 + 10.5

Combine like terms: -10.5 + 10.5 = 0.0
0.0 + y + y2 = 0 + 10.5
y + y2 = 0 + 10.5

Combine like terms: 0 + 10.5 = 10.5
y + y2 = 10.5

The y term is y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + y2 = 10.5 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + y2 = 10.5 + 0.25

Combine like terms: 10.5 + 0.25 = 10.75
1.25 + y2 = 10.75

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 10.75

Calculate the square root of the right side: 3.278719262

Break this problem into two subproblems by setting 
(y + 0.5) equal to 3.278719262 and -3.278719262.

Subproblem 1

y + 0.5 = 3.278719262 Simplifying y + 0.5 = 3.278719262 Reorder the terms: 0.5 + y = 3.278719262 Solving 0.5 + y = 3.278719262 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = 3.278719262 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 3.278719262 + -0.5 y = 3.278719262 + -0.5 Combine like terms: 3.278719262 + -0.5 = 2.778719262 y = 2.778719262 Simplifying y = 2.778719262

Subproblem 2

y + 0.5 = -3.278719262 Simplifying y + 0.5 = -3.278719262 Reorder the terms: 0.5 + y = -3.278719262 Solving 0.5 + y = -3.278719262 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = -3.278719262 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -3.278719262 + -0.5 y = -3.278719262 + -0.5 Combine like terms: -3.278719262 + -0.5 = -3.778719262 y = -3.778719262 Simplifying y = -3.778719262

Solution

The solution to the problem is based on the solutions from the subproblems. y = {2.778719262, -3.778719262}

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