y^2+10y-23=0

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Solution for y^2+10y-23=0 equation:


Simplifying
y2 + 10y + -23 = 0

Reorder the terms:
-23 + 10y + y2 = 0

Solving
-23 + 10y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '23' to each side of the equation.
-23 + 10y + 23 + y2 = 0 + 23

Reorder the terms:
-23 + 23 + 10y + y2 = 0 + 23

Combine like terms: -23 + 23 = 0
0 + 10y + y2 = 0 + 23
10y + y2 = 0 + 23

Combine like terms: 0 + 23 = 23
10y + y2 = 23

The y term is 10y.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10y + 25 + y2 = 23 + 25

Reorder the terms:
25 + 10y + y2 = 23 + 25

Combine like terms: 23 + 25 = 48
25 + 10y + y2 = 48

Factor a perfect square on the left side:
(y + 5)(y + 5) = 48

Calculate the square root of the right side: 6.92820323

Break this problem into two subproblems by setting 
(y + 5) equal to 6.92820323 and -6.92820323.

Subproblem 1

y + 5 = 6.92820323 Simplifying y + 5 = 6.92820323 Reorder the terms: 5 + y = 6.92820323 Solving 5 + y = 6.92820323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + y = 6.92820323 + -5 Combine like terms: 5 + -5 = 0 0 + y = 6.92820323 + -5 y = 6.92820323 + -5 Combine like terms: 6.92820323 + -5 = 1.92820323 y = 1.92820323 Simplifying y = 1.92820323

Subproblem 2

y + 5 = -6.92820323 Simplifying y + 5 = -6.92820323 Reorder the terms: 5 + y = -6.92820323 Solving 5 + y = -6.92820323 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + y = -6.92820323 + -5 Combine like terms: 5 + -5 = 0 0 + y = -6.92820323 + -5 y = -6.92820323 + -5 Combine like terms: -6.92820323 + -5 = -11.92820323 y = -11.92820323 Simplifying y = -11.92820323

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.92820323, -11.92820323}

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