y^2+15y+35=0

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Solution for y^2+15y+35=0 equation:


Simplifying
y2 + 15y + 35 = 0

Reorder the terms:
35 + 15y + y2 = 0

Solving
35 + 15y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '-35' to each side of the equation.
35 + 15y + -35 + y2 = 0 + -35

Reorder the terms:
35 + -35 + 15y + y2 = 0 + -35

Combine like terms: 35 + -35 = 0
0 + 15y + y2 = 0 + -35
15y + y2 = 0 + -35

Combine like terms: 0 + -35 = -35
15y + y2 = -35

The y term is 15y.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15y + 56.25 + y2 = -35 + 56.25

Reorder the terms:
56.25 + 15y + y2 = -35 + 56.25

Combine like terms: -35 + 56.25 = 21.25
56.25 + 15y + y2 = 21.25

Factor a perfect square on the left side:
(y + 7.5)(y + 7.5) = 21.25

Calculate the square root of the right side: 4.609772229

Break this problem into two subproblems by setting 
(y + 7.5) equal to 4.609772229 and -4.609772229.

Subproblem 1

y + 7.5 = 4.609772229 Simplifying y + 7.5 = 4.609772229 Reorder the terms: 7.5 + y = 4.609772229 Solving 7.5 + y = 4.609772229 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + y = 4.609772229 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + y = 4.609772229 + -7.5 y = 4.609772229 + -7.5 Combine like terms: 4.609772229 + -7.5 = -2.890227771 y = -2.890227771 Simplifying y = -2.890227771

Subproblem 2

y + 7.5 = -4.609772229 Simplifying y + 7.5 = -4.609772229 Reorder the terms: 7.5 + y = -4.609772229 Solving 7.5 + y = -4.609772229 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + y = -4.609772229 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + y = -4.609772229 + -7.5 y = -4.609772229 + -7.5 Combine like terms: -4.609772229 + -7.5 = -12.109772229 y = -12.109772229 Simplifying y = -12.109772229

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-2.890227771, -12.109772229}

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