y^2+15y-3=0

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Solution for y^2+15y-3=0 equation:


Simplifying
y2 + 15y + -3 = 0

Reorder the terms:
-3 + 15y + y2 = 0

Solving
-3 + 15y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 15y + 3 + y2 = 0 + 3

Reorder the terms:
-3 + 3 + 15y + y2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 15y + y2 = 0 + 3
15y + y2 = 0 + 3

Combine like terms: 0 + 3 = 3
15y + y2 = 3

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 = 3 + 56.25

Reorder the terms:
56.25 + 15y + y2 = 3 + 56.25

Combine like terms: 3 + 56.25 = 59.25
56.25 + 15y + y2 = 59.25

Factor a perfect square on the left side:
(y + 7.5)(y + 7.5) = 59.25

Calculate the square root of the right side: 7.697402159

Break this problem into two subproblems by setting 
(y + 7.5) equal to 7.697402159 and -7.697402159.

Subproblem 1

y + 7.5 = 7.697402159 Simplifying y + 7.5 = 7.697402159 Reorder the terms: 7.5 + y = 7.697402159 Solving 7.5 + y = 7.697402159 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 = 7.697402159 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + y = 7.697402159 + -7.5 y = 7.697402159 + -7.5 Combine like terms: 7.697402159 + -7.5 = 0.197402159 y = 0.197402159 Simplifying y = 0.197402159

Subproblem 2

y + 7.5 = -7.697402159 Simplifying y + 7.5 = -7.697402159 Reorder the terms: 7.5 + y = -7.697402159 Solving 7.5 + y = -7.697402159 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 = -7.697402159 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + y = -7.697402159 + -7.5 y = -7.697402159 + -7.5 Combine like terms: -7.697402159 + -7.5 = -15.197402159 y = -15.197402159 Simplifying y = -15.197402159

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.197402159, -15.197402159}

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