y^2-2y-5=0

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Solution for y^2-2y-5=0 equation:


Simplifying
y2 + -2y + -5 = 0

Reorder the terms:
-5 + -2y + y2 = 0

Solving
-5 + -2y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -2y + 5 + y2 = 0 + 5

Reorder the terms:
-5 + 5 + -2y + y2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -2y + y2 = 0 + 5
-2y + y2 = 0 + 5

Combine like terms: 0 + 5 = 5
-2y + y2 = 5

The y term is -2y.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2y + 1 + y2 = 5 + 1

Reorder the terms:
1 + -2y + y2 = 5 + 1

Combine like terms: 5 + 1 = 6
1 + -2y + y2 = 6

Factor a perfect square on the left side:
(y + -1)(y + -1) = 6

Calculate the square root of the right side: 2.449489743

Break this problem into two subproblems by setting 
(y + -1) equal to 2.449489743 and -2.449489743.

Subproblem 1

y + -1 = 2.449489743 Simplifying y + -1 = 2.449489743 Reorder the terms: -1 + y = 2.449489743 Solving -1 + y = 2.449489743 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = 2.449489743 + 1 Combine like terms: -1 + 1 = 0 0 + y = 2.449489743 + 1 y = 2.449489743 + 1 Combine like terms: 2.449489743 + 1 = 3.449489743 y = 3.449489743 Simplifying y = 3.449489743

Subproblem 2

y + -1 = -2.449489743 Simplifying y + -1 = -2.449489743 Reorder the terms: -1 + y = -2.449489743 Solving -1 + y = -2.449489743 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + y = -2.449489743 + 1 Combine like terms: -1 + 1 = 0 0 + y = -2.449489743 + 1 y = -2.449489743 + 1 Combine like terms: -2.449489743 + 1 = -1.449489743 y = -1.449489743 Simplifying y = -1.449489743

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.449489743, -1.449489743}

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