25=y+y^2

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Solution for 25=y+y^2 equation:


Simplifying
25 = y + y2

Solving
25 = y + y2

Solving for variable 'y'.

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

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

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

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

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

Move the constant term to the right:

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

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

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

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

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 = 25 + 0.25

Combine like terms:  + 0.25 = 1.25
1.25 + y2 = 25 + 0.25

Combine like terms: 25 + 0.25 = 25.25
1.25 + y2 = 25.25

Factor a perfect square on the left side:
(y + 0.5)(y + 0.5) = 25.25

Calculate the square root of the right side: 5.024937811

Break this problem into two subproblems by setting 
(y + 0.5) equal to 5.024937811 and -5.024937811.

Subproblem 1

y + 0.5 = 5.024937811 Simplifying y + 0.5 = 5.024937811 Reorder the terms: 0.5 + y = 5.024937811 Solving 0.5 + y = 5.024937811 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 = 5.024937811 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = 5.024937811 + -0.5 y = 5.024937811 + -0.5 Combine like terms: 5.024937811 + -0.5 = 4.524937811 y = 4.524937811 Simplifying y = 4.524937811

Subproblem 2

y + 0.5 = -5.024937811 Simplifying y + 0.5 = -5.024937811 Reorder the terms: 0.5 + y = -5.024937811 Solving 0.5 + y = -5.024937811 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 = -5.024937811 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + y = -5.024937811 + -0.5 y = -5.024937811 + -0.5 Combine like terms: -5.024937811 + -0.5 = -5.524937811 y = -5.524937811 Simplifying y = -5.524937811

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.524937811, -5.524937811}

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