0=y^2+28y-25

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Solution for 0=y^2+28y-25 equation:


Simplifying
0 = y2 + 28y + -25

Reorder the terms:
0 = -25 + 28y + y2

Solving
0 = -25 + 28y + y2

Solving for variable 'y'.

Combine like terms: 0 + 25 = 25
25 + -28y + -1y2 = -25 + 28y + y2 + 25 + -28y + -1y2

Reorder the terms:
25 + -28y + -1y2 = -25 + 25 + 28y + -28y + y2 + -1y2

Combine like terms: -25 + 25 = 0
25 + -28y + -1y2 = 0 + 28y + -28y + y2 + -1y2
25 + -28y + -1y2 = 28y + -28y + y2 + -1y2

Combine like terms: 28y + -28y = 0
25 + -28y + -1y2 = 0 + y2 + -1y2
25 + -28y + -1y2 = y2 + -1y2

Combine like terms: y2 + -1y2 = 0
25 + -28y + -1y2 = 0

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

Divide each side by '-1'.
-25 + 28y + y2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 28y + 25 + y2 = 0 + 25

Reorder the terms:
-25 + 25 + 28y + y2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 28y + y2 = 0 + 25
28y + y2 = 0 + 25

Combine like terms: 0 + 25 = 25
28y + y2 = 25

The y term is 28y.  Take half its coefficient (14).
Square it (196) and add it to both sides.

Add '196' to each side of the equation.
28y + 196 + y2 = 25 + 196

Reorder the terms:
196 + 28y + y2 = 25 + 196

Combine like terms: 25 + 196 = 221
196 + 28y + y2 = 221

Factor a perfect square on the left side:
(y + 14)(y + 14) = 221

Calculate the square root of the right side: 14.866068747

Break this problem into two subproblems by setting 
(y + 14) equal to 14.866068747 and -14.866068747.

Subproblem 1

y + 14 = 14.866068747 Simplifying y + 14 = 14.866068747 Reorder the terms: 14 + y = 14.866068747 Solving 14 + y = 14.866068747 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + y = 14.866068747 + -14 Combine like terms: 14 + -14 = 0 0 + y = 14.866068747 + -14 y = 14.866068747 + -14 Combine like terms: 14.866068747 + -14 = 0.866068747 y = 0.866068747 Simplifying y = 0.866068747

Subproblem 2

y + 14 = -14.866068747 Simplifying y + 14 = -14.866068747 Reorder the terms: 14 + y = -14.866068747 Solving 14 + y = -14.866068747 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-14' to each side of the equation. 14 + -14 + y = -14.866068747 + -14 Combine like terms: 14 + -14 = 0 0 + y = -14.866068747 + -14 y = -14.866068747 + -14 Combine like terms: -14.866068747 + -14 = -28.866068747 y = -28.866068747 Simplifying y = -28.866068747

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.866068747, -28.866068747}

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