y^2+15y-10=0

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Solution for y^2+15y-10=0 equation:


Simplifying
y2 + 15y + -10 = 0

Reorder the terms:
-10 + 15y + y2 = 0

Solving
-10 + 15y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '10' to each side of the equation.
-10 + 15y + 10 + y2 = 0 + 10

Reorder the terms:
-10 + 10 + 15y + y2 = 0 + 10

Combine like terms: -10 + 10 = 0
0 + 15y + y2 = 0 + 10
15y + y2 = 0 + 10

Combine like terms: 0 + 10 = 10
15y + y2 = 10

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 = 10 + 56.25

Reorder the terms:
56.25 + 15y + y2 = 10 + 56.25

Combine like terms: 10 + 56.25 = 66.25
56.25 + 15y + y2 = 66.25

Factor a perfect square on the left side:
(y + 7.5)(y + 7.5) = 66.25

Calculate the square root of the right side: 8.139410298

Break this problem into two subproblems by setting 
(y + 7.5) equal to 8.139410298 and -8.139410298.

Subproblem 1

y + 7.5 = 8.139410298 Simplifying y + 7.5 = 8.139410298 Reorder the terms: 7.5 + y = 8.139410298 Solving 7.5 + y = 8.139410298 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 = 8.139410298 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + y = 8.139410298 + -7.5 y = 8.139410298 + -7.5 Combine like terms: 8.139410298 + -7.5 = 0.639410298 y = 0.639410298 Simplifying y = 0.639410298

Subproblem 2

y + 7.5 = -8.139410298 Simplifying y + 7.5 = -8.139410298 Reorder the terms: 7.5 + y = -8.139410298 Solving 7.5 + y = -8.139410298 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 = -8.139410298 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + y = -8.139410298 + -7.5 y = -8.139410298 + -7.5 Combine like terms: -8.139410298 + -7.5 = -15.639410298 y = -15.639410298 Simplifying y = -15.639410298

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.639410298, -15.639410298}

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