y=y^2+2y-4

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Solution for y=y^2+2y-4 equation:


Simplifying
y = y2 + 2y + -4

Reorder the terms:
y = -4 + 2y + y2

Solving
y = -4 + 2y + y2

Solving for variable 'y'.

Reorder the terms:
4 + y + -2y + -1y2 = -4 + 2y + y2 + 4 + -2y + -1y2

Combine like terms: y + -2y = -1y
4 + -1y + -1y2 = -4 + 2y + y2 + 4 + -2y + -1y2

Reorder the terms:
4 + -1y + -1y2 = -4 + 4 + 2y + -2y + y2 + -1y2

Combine like terms: -4 + 4 = 0
4 + -1y + -1y2 = 0 + 2y + -2y + y2 + -1y2
4 + -1y + -1y2 = 2y + -2y + y2 + -1y2

Combine like terms: 2y + -2y = 0
4 + -1y + -1y2 = 0 + y2 + -1y2
4 + -1y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
4 + -1y + -1y2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-4 + y + y2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + y + 4 + y2 = 0 + 4

Reorder the terms:
-4 + 4 + y + y2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + y + y2 = 0 + 4
y + y2 = 0 + 4

Combine like terms: 0 + 4 = 4
y + y2 = 4

The y term is y.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
 + 0.25 + y2 = 4 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + y2 = 4 + 0.25

Combine like terms: 4 + 0.25 = 4.25
1.25 + y2 = 4.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 4.25

Calculate the square root of the right side: 2.061552813

Break this problem into two subproblems by setting 
(y + 0.5) equal to 2.061552813 and -2.061552813.

Subproblem 1

y + 0.5 = 2.061552813 Simplifying y + 0.5 = 2.061552813 Reorder the terms: 0.5 + y = 2.061552813 Solving 0.5 + y = 2.061552813 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = 2.061552813 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 2.061552813 + -0.5 y = 2.061552813 + -0.5 Combine like terms: 2.061552813 + -0.5 = 1.561552813 y = 1.561552813 Simplifying y = 1.561552813

Subproblem 2

y + 0.5 = -2.061552813 Simplifying y + 0.5 = -2.061552813 Reorder the terms: 0.5 + y = -2.061552813 Solving 0.5 + y = -2.061552813 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + y = -2.061552813 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -2.061552813 + -0.5 y = -2.061552813 + -0.5 Combine like terms: -2.061552813 + -0.5 = -2.561552813 y = -2.561552813 Simplifying y = -2.561552813

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.561552813, -2.561552813}

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