y^2+2y-20=0

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Solution for y^2+2y-20=0 equation:


Simplifying
y2 + 2y + -20 = 0

Reorder the terms:
-20 + 2y + y2 = 0

Solving
-20 + 2y + y2 = 0

Solving for variable 'y'.

Begin completing the square.

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 2y + 20 + y2 = 0 + 20

Reorder the terms:
-20 + 20 + 2y + y2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 2y + y2 = 0 + 20
2y + y2 = 0 + 20

Combine like terms: 0 + 20 = 20
2y + y2 = 20

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 = 20 + 1

Reorder the terms:
1 + 2y + y2 = 20 + 1

Combine like terms: 20 + 1 = 21
1 + 2y + y2 = 21

Factor a perfect square on the left side:
(y + 1)(y + 1) = 21

Calculate the square root of the right side: 4.582575695

Break this problem into two subproblems by setting 
(y + 1) equal to 4.582575695 and -4.582575695.

Subproblem 1

y + 1 = 4.582575695 Simplifying y + 1 = 4.582575695 Reorder the terms: 1 + y = 4.582575695 Solving 1 + y = 4.582575695 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 = 4.582575695 + -1 Combine like terms: 1 + -1 = 0 0 + y = 4.582575695 + -1 y = 4.582575695 + -1 Combine like terms: 4.582575695 + -1 = 3.582575695 y = 3.582575695 Simplifying y = 3.582575695

Subproblem 2

y + 1 = -4.582575695 Simplifying y + 1 = -4.582575695 Reorder the terms: 1 + y = -4.582575695 Solving 1 + y = -4.582575695 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 = -4.582575695 + -1 Combine like terms: 1 + -1 = 0 0 + y = -4.582575695 + -1 y = -4.582575695 + -1 Combine like terms: -4.582575695 + -1 = -5.582575695 y = -5.582575695 Simplifying y = -5.582575695

Solution

The solution to the problem is based on the solutions from the subproblems. y = {3.582575695, -5.582575695}

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