y^2-12y=-25

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Solution for y^2-12y=-25 equation:


Simplifying
y2 + -12y = -25

Reorder the terms:
-12y + y2 = -25

Solving
-12y + y2 = -25

Solving for variable 'y'.

Reorder the terms:
25 + -12y + y2 = -25 + 25

Combine like terms: -25 + 25 = 0
25 + -12y + y2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + -12y + -25 + y2 = 0 + -25

Reorder the terms:
25 + -25 + -12y + y2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + -12y + y2 = 0 + -25
-12y + y2 = 0 + -25

Combine like terms: 0 + -25 = -25
-12y + y2 = -25

The y term is -12y.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12y + 36 + y2 = -25 + 36

Reorder the terms:
36 + -12y + y2 = -25 + 36

Combine like terms: -25 + 36 = 11
36 + -12y + y2 = 11

Factor a perfect square on the left side:
(y + -6)(y + -6) = 11

Calculate the square root of the right side: 3.31662479

Break this problem into two subproblems by setting 
(y + -6) equal to 3.31662479 and -3.31662479.

Subproblem 1

y + -6 = 3.31662479 Simplifying y + -6 = 3.31662479 Reorder the terms: -6 + y = 3.31662479 Solving -6 + y = 3.31662479 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + y = 3.31662479 + 6 Combine like terms: -6 + 6 = 0 0 + y = 3.31662479 + 6 y = 3.31662479 + 6 Combine like terms: 3.31662479 + 6 = 9.31662479 y = 9.31662479 Simplifying y = 9.31662479

Subproblem 2

y + -6 = -3.31662479 Simplifying y + -6 = -3.31662479 Reorder the terms: -6 + y = -3.31662479 Solving -6 + y = -3.31662479 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + y = -3.31662479 + 6 Combine like terms: -6 + 6 = 0 0 + y = -3.31662479 + 6 y = -3.31662479 + 6 Combine like terms: -3.31662479 + 6 = 2.68337521 y = 2.68337521 Simplifying y = 2.68337521

Solution

The solution to the problem is based on the solutions from the subproblems. y = {9.31662479, 2.68337521}

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