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 = 61
36 + -12y + y2 = 61

Factor a perfect square on the left side:
(y + -6)(y + -6) = 61

Calculate the square root of the right side: 7.810249676

Break this problem into two subproblems by setting 
(y + -6) equal to 7.810249676 and -7.810249676.

Subproblem 1

y + -6 = 7.810249676 Simplifying y + -6 = 7.810249676 Reorder the terms: -6 + y = 7.810249676 Solving -6 + y = 7.810249676 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 = 7.810249676 + 6 Combine like terms: -6 + 6 = 0 0 + y = 7.810249676 + 6 y = 7.810249676 + 6 Combine like terms: 7.810249676 + 6 = 13.810249676 y = 13.810249676 Simplifying y = 13.810249676

Subproblem 2

y + -6 = -7.810249676 Simplifying y + -6 = -7.810249676 Reorder the terms: -6 + y = -7.810249676 Solving -6 + y = -7.810249676 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 = -7.810249676 + 6 Combine like terms: -6 + 6 = 0 0 + y = -7.810249676 + 6 y = -7.810249676 + 6 Combine like terms: -7.810249676 + 6 = -1.810249676 y = -1.810249676 Simplifying y = -1.810249676

Solution

The solution to the problem is based on the solutions from the subproblems. y = {13.810249676, -1.810249676}

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