y^2+4y-5=02

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Solution for y^2+4y-5=02 equation:


Simplifying
y2 + 4y + -5 = 2

Reorder the terms:
-5 + 4y + y2 = 2

Solving
-5 + 4y + y2 = 2

Solving for variable 'y'.

Reorder the terms:
-5 + -2 + 4y + y2 = 2 + -2

Combine like terms: -5 + -2 = -7
-7 + 4y + y2 = 2 + -2

Combine like terms: 2 + -2 = 0
-7 + 4y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + 4y + 7 + y2 = 0 + 7

Reorder the terms:
-7 + 7 + 4y + y2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + 4y + y2 = 0 + 7
4y + y2 = 0 + 7

Combine like terms: 0 + 7 = 7
4y + y2 = 7

The y term is 4y.  Take half its coefficient (2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
4y + 4 + y2 = 7 + 4

Reorder the terms:
4 + 4y + y2 = 7 + 4

Combine like terms: 7 + 4 = 11
4 + 4y + y2 = 11

Factor a perfect square on the left side:
(y + 2)(y + 2) = 11

Calculate the square root of the right side: 3.31662479

Break this problem into two subproblems by setting 
(y + 2) equal to 3.31662479 and -3.31662479.

Subproblem 1

y + 2 = 3.31662479 Simplifying y + 2 = 3.31662479 Reorder the terms: 2 + y = 3.31662479 Solving 2 + y = 3.31662479 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + y = 3.31662479 + -2 Combine like terms: 2 + -2 = 0 0 + y = 3.31662479 + -2 y = 3.31662479 + -2 Combine like terms: 3.31662479 + -2 = 1.31662479 y = 1.31662479 Simplifying y = 1.31662479

Subproblem 2

y + 2 = -3.31662479 Simplifying y + 2 = -3.31662479 Reorder the terms: 2 + y = -3.31662479 Solving 2 + y = -3.31662479 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + y = -3.31662479 + -2 Combine like terms: 2 + -2 = 0 0 + y = -3.31662479 + -2 y = -3.31662479 + -2 Combine like terms: -3.31662479 + -2 = -5.31662479 y = -5.31662479 Simplifying y = -5.31662479

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.31662479, -5.31662479}

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