13y-y^2=25

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Solution for 13y-y^2=25 equation:


Simplifying
13y + -1y2 = 25

Solving
13y + -1y2 = 25

Solving for variable 'y'.

Reorder the terms:
-25 + 13y + -1y2 = 25 + -25

Combine like terms: 25 + -25 = 0
-25 + 13y + -1y2 = 0

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

Divide each side by '-1'.
25 + -13y + y2 = 0

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + -13y + -25 + y2 = 0 + -25

Reorder the terms:
25 + -25 + -13y + y2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + -13y + y2 = 0 + -25
-13y + y2 = 0 + -25

Combine like terms: 0 + -25 = -25
-13y + y2 = -25

The y term is -13y.  Take half its coefficient (-6.5).
Square it (42.25) and add it to both sides.

Add '42.25' to each side of the equation.
-13y + 42.25 + y2 = -25 + 42.25

Reorder the terms:
42.25 + -13y + y2 = -25 + 42.25

Combine like terms: -25 + 42.25 = 17.25
42.25 + -13y + y2 = 17.25

Factor a perfect square on the left side:
(y + -6.5)(y + -6.5) = 17.25

Calculate the square root of the right side: 4.153311931

Break this problem into two subproblems by setting 
(y + -6.5) equal to 4.153311931 and -4.153311931.

Subproblem 1

y + -6.5 = 4.153311931 Simplifying y + -6.5 = 4.153311931 Reorder the terms: -6.5 + y = 4.153311931 Solving -6.5 + y = 4.153311931 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + y = 4.153311931 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + y = 4.153311931 + 6.5 y = 4.153311931 + 6.5 Combine like terms: 4.153311931 + 6.5 = 10.653311931 y = 10.653311931 Simplifying y = 10.653311931

Subproblem 2

y + -6.5 = -4.153311931 Simplifying y + -6.5 = -4.153311931 Reorder the terms: -6.5 + y = -4.153311931 Solving -6.5 + y = -4.153311931 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + y = -4.153311931 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + y = -4.153311931 + 6.5 y = -4.153311931 + 6.5 Combine like terms: -4.153311931 + 6.5 = 2.346688069 y = 2.346688069 Simplifying y = 2.346688069

Solution

The solution to the problem is based on the solutions from the subproblems. y = {10.653311931, 2.346688069}

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